The World Cup is coming thick and fast, and the participating nations are moving quickly to announce their squads and inform players to keep themselves fit for the biggest celebration of football. Some countries are yet to announce their squads, but lets take a look at the countries that have already announced their squads:

Argentina:

Goalkeepers: Sergio Romero, Nahuel Guzman, Willy Caballero, Franco Armani.

Defenders: Gabriel Mercado, Nicolás Otamendi, Federico Fazio, Nicolás Tagliafico, Marcos Rojo, Marcos Acuña, Ramiro Funes Mori, Cristian Ansaldi, Eduardo Salvio, Germán Pezzella.

Midfielders: Javier Mascherano, Ángel Di María, Ever Banega, Lucas Biglia, Manuel Lanzini, Giovanni Lo Celso, Ricardo Centurión, Guido Pizarro, Leandro Paredes, Maximiliano Meza, Enzo Pérez, Pablo Pérez, Rodrigo Battaglia.

Forwards: Lionel Messi, Sergio Agüero, Gonzalo Higuaín, Paulo Dybala, Mauro Icardi Cristian Pavón, Lautaro Martínez, Diego Perotti.

Big name Omissions: Matias Kranevitter, Angel Correa, Carlos Tevez, Rodrigo Palacio.

Australia:

Goalkeepers: Mat Ryan (Brighton), Brad Jones (Feyenoord), Danny Vukovic (Genk)

Defenders: Trent Sainsbury (Grasshoppers), Matthew Jurman (Suwon), Milos Degenek (Yokohama Marinos), Joshua Risdon (Western Sydney Wanderers), Aziz Behich (Bursaspor), James Meredith (Millwall), Fran Karacic (NK Lokomotiva).

Midfielders: Mile Jedinak (Aston Villa), Aaron Mooy (Huddersfield), Tom Rogic (Celtic), Massimo Luongo (QPR), Jackson Irvine (Hull City), Joshua Brillante (Sydney FC), Dimi Petratos (Newcastle Jets), Mark Milligan (Al Ahli).

Attackers: Tim Cahill (Millwall), Tomi Juric (FC Luzern), Mathew Leckie (Hertha Berlin), James Troisi (Melbourne Victory), Daniel Arzani (Melbourne City), Andrew Nabbout (Urawa Red Diamonds), Nikita Rukavytsya (Maccabi Haifa), Robbie Kruse (Bochum).

Brazil:

Goalkeepers: Alisson, Ederson, Cassio

Defenders: Marcelo, Danilo, Filipe Luis, Fagner, Marquinhos, Thiago Silva, Miranda, Pedro Geromel

Midfielder: Willian, Fernandinho, Paulinho, Casemiro, Philippe Coutinho, Renato Augusto, Fred

Forwards: Neymar, Gabriel Jesus, Roberto Firmino, Douglas Costa, Taison.

Big name Omissions: Dani Alves, Hulk, Oscar, Jo, Fred (Striker)

Colombia:

Goalkeepers: David Ospina (Arsenal), Camilo Vargas (Deportivo Cali), Iván Arboleda (Banfield), José Fernando Cuadrado (Once Caldas)

Defenders: Cristian Zapata (Milan), Dávinson Sánchez (Tottenham), Santiago Arias (PSV Eindhoven), Óscar Murillo (Pachuca), Frank Fabra (Boca Juniors), Johan Mojica (Girona ), Yerry Mina (Barcelona), William Tesillo (Santa Fe), Bernardo Espinosa (Girona), Stefan Medina (Monterrey), Farid Díaz (Olimpia)

Midfielders: Wílmar Barrios (Boca Juniors), Carlos Sánchez (Espanyol), Jefferson Lerma (Levante), José Izquierdo (Brighton Hove & Albion), James Rodríguez (Bayern Múnich), Giovanni Moreno (Shanghái Shenhua), Abel Aguilar (Deportivo Cali), Mateus Uribe (América), Yimmi Chará (Júnior), Juan Fernando Quintero (River Plate), Edwin Cardona (Boca Juniors), Juan Guillermo Cuadrado (Juventus), Gustavo Cuéllar (Flamengo), Sebastián Pérez (Boca Juniors)

Forwards: Radamel Falcao García (Mónaco), Duván Zapata (Sampdoria), Miguel Borja (Palmeiras), Carlos Bacca (Villarreal), Luis Fernando Muriel (Sevilla), Teófilo Gutiérrez (Júnior)

Big name Omissions: Jackson Martinez

Costa Rica:

Goalkeepers: Keylor Navas, Patrick Pemberton, Leonel Moreira

Defenders: Cristian Gamboa, Ian Smith, Ronald Matarrita, Bryan Oviedo, Oscar Duarte, Giancarlo Gonzalez, Francisco Calvo, Kendall Waston, Johnny Acosta

Midfielders: David Guzman, Yeltsin Tejeda, Celso Borges, Randall Azofeifa, Rodney Wallace

Forwards: Bryan Ruiz, Daniel Colindres, Christian Bolanos, Johan Venegas, Joel Campbell, Marco Urena.

Croatia:

Goalkeepers: Danijel Subasic, Lovre Kalinic, Dominik Livakovic, Karlo Letica

Defenders: Vedran Corluka, Domagoj Vida, Ivan Strinic, Dejan Lovren, Sime Vrsaljko, Josip Pivaric, Tin Jedvaj, Matej Mitrovic, Borna Barisic, Zoran Nizic, Duje Caleta-Car, Borna Sosa

Midfielders: Luka Modric, Ivan Rakitic, Mateo Kovacic, Milan Badelj, Marcelo Brozovic, Marko Rog, Mario Pasalic, Filip Bradaric

Forwards: Mario Mandzukic, Ivan Perisic, Nikola Kalinic, Andrej Kramaric, Marko Pjaca, Ante Rebic, Duje Cop, Ivan Santini

Denmark:

Goalkeepers: Kasper Schmeichel, Jonas Lossl, Frederik Ronow, Jesper Hansen

Defenders: Simon Kjaer, Andreas Christensen, Mathias Jorgensen, Jannik Vestergaard, Andreas Bjelland, Henrik Dalsgaard, Peter Ankersen, Jens Stryger, Riza Durmisi, Jonas Knudsen, Nicolai Boilesen

Midfielders: William Kvist, Thomas Delaney, Lukas Lerager , Lasse Schone, Mike Jensen, Christian Eriksen, Daniel Wass, Pierre-Emile Hojbjerg, Mathias Jensen, Michael Krohn-Dehli, Robert Skov

Forwards: Pione Sisto , Martin Braithwaite, Andreas Cornelius, Viktor Fischer, Yussuf Poulsen, Nicolai Jorgensen, Nicklas Bendtner, Kasper Dolberg, Kenneth Zohore

Egypt:

Goalkeepers: Essam El Hadary, Mohamed El-Shennawy, Sherif Ekramy, Mohamed Awad

Defenders: Ahmed Fathi, Saad Samir, Ayman Ashraf, Mahmoud Hamdy, Mohamed Abdel-Shafy, Ahmed Hegazi and Ali Gabr, Ahmed Elmohamady, Karim Hafez, Omar Gaber, Amro Tarek

Midfielders: Tarek Hamed, Mahmoud Abdel Aziz, Shikabala, Abdallah Said, Sam Morsy, Mohamed Elneny, Kahraba, Ramadan Sobhi, Trezeguet, Amr Warda

Forwards: Marwan Mohsen, Ahmed Gomaa, Kouka, Mohamed Salah

Germany:

Goalkeepers: Bernd Leno, Manuel Neuer, Marc-André ter Stegen, Kevin Trapp

Defenders: Jérôme Boateng, Matthias Ginter, Jonas Hector, Mats Hummels, Joshua Kimmich, Marvin Plattenhardt, Antonio Rüdiger, Niklas Süle, Jonathan Tah

Midfielders: Julian Draxler, Leon Goretzka, Ilkay Gündogan, Sami Khedira, Toni Kroos, Mesut Özil, Marco Reus, Sebastian Rudy

Forwards: Julian Brandt, Mario Gomez, Thomas Müller, Nils Petersen, Leroy Sanè, Timo Werner

Big name Omissions: Max Meyer, Skhodran Mustafi, Mario Gotze, Emre Can, Sandro Wagner.

Iceland:

Goalkeepers: Hannes Thor Halldorsson, Runar Alex Runarsson, Frederik Schram

Defenders: Kari Arnason, Ari Freyr Skulason, Birkir Mar Saevarsson, Sverrir Ingi Ingason, Hordur Magnusson, Holmar Orn Eyjolfsson, Ragnar Sigurdsson

Midfielders: Johann Berg Gudmundsson, Birkir Bjarnason, Arnor Ingvi Traustason, Emil Hallfredsson, Gylfi Sigurdsson, Olafur Ingi Skulason, Rurik Gislason, Samuel Fridjonsson, Aron Gunnarsson

Forwards: Alfred Finnbogason, Bjorn Bergmann Sigurdarson, Jon Dadi Bodvarsson, Albert Gudmundsson

Iran:

Goalkeepers: Alireza Beiranvand, Seyed Hossein Hosseini, Rashid Mazaheri, Amir Abedzadeh

Defenders: Ramin Rezaeian, Voria Ghafouri, Steven Beitashour, Seyed Jalal Hosseini, Mohammad Reza Khanzadeh, Morteza Pouraliganji, Mohammad Ansari, Pejman Montazeri, Seyed Majid Hosseini, Milad Mohammadi, Omid Norafkan, Saeid AGhaei, Roozbeh Cheshmi

Midfielders: Saeid Ezatolahi, Masoud Shojaei, Ahmad Abdolahzadeh, Saman Ghoddos, Mahdi Torabi, Ashkan Dejagah, Omid Ebrahimi, Ehsan Hajsafi, Ali Karimi, Soroush Rafiei, Ali Gholizadeh, Vahid Amiri

Forwards: Alireza Jahanbakhsh, Karim Ansarifard, Mahdi Taremi, Sardar Azmoun, Reza Ghoochannejhad, Kaveh Rezaei

Mexico:

Goalkeepers: Guillermo Ochoa, Jesús Corona, Alfredo Talavera

Defenders: Diego Reyes, Héctor Moreno, Miguel Layún, Carlos Salcedo, Edson Álvarez, Néstor Araujo, Jesús Gallardo, Hugo Ayala, Rafael Márquez

Midfielders: Jonathan dos Santos, Andrés Guardado, Héctor Herrera, Marco Fabián, Javier Aquino, Jonathan González, Jesús Molina, Erick Gutiérrez

Forwards: Tecatito Corona, Hirving Lozano, Chicharito Hernández, Raúl Jiménez, Carlos Vela, Javier Aquino, Jurgen Damm y Giovani dos Santos

Nigeria:

Goalkeepers: Ikechukwu Ezenwa, Daniel Akpeyi, Francis Uzoho, Dele Ajiboye

Defenders: William Troost-Ekong, Leon Balogun, Olaoluwa Aina, Kenneth Omeruo, Bryan Idowu, Chidozie Awaziem, Abdullahi Shehu, Elderson Echiejile, Tyronne Ebuehi, Stephen Eze

Midfielders: John Obi Mikel, Ogenyi Onazi, John Ogu, Wilfred Ndidi, Uche Agbo, Oghenekaro Etebo, Joel Obi

Forwards: Mikel Agu; Odion Ighalo, Ahmed Musa, Victor Moses, Alex Iwobi, Kelechi Iheanacho, Moses Simon, Junior Lokosa, Simeon Nwankwo

Panama:

Goalkeepers: Jose Calderon (Chorrillo), Jaime Penedo (Dinamo Bucharest), Alex Rodríguez (San Francisco FC)

Defenders: Azmahar Ariano (Patriotas FC), Felipe Baloy (CSD Municipal), Harold Cummings (San Jose Earthquakes), Eric Davis (Dunajska Streda), Fidel Escobar (New York Red Bulls), Adolfo Machado (Houston Dynamo), Michael Murillo (New York Red Bulls), Luis Ovalle (CD Olimpia), Francisco Palacios (San Francisco FC), Richard Peralta (Alianza), Roman Torres (Seattle Sounders)

Midfielders: Ricardo Avila (KAA Gent), Edgar Barcenas (Cafetaleros de Tapachula), Ricardo Buitrago (Municipal), Miguel Camargo (Universidad San Martín de Porres), Adalberto Carrasquilla (Tauro FC), Armando Cooper (Club Universidad de Chile),Anibal Godoy (San Jose Earthquakes), Gabriel Gomez (Bucaramanga), Jose Gonzalez (Union Comercio), Cristian Martínez (Columbus Crew), Valentin Pimentel (Plaza Amador), Alberto Quintero (Universitario de Lima), Jose Luis Rodríguez (KAA Gent)

Forwards: Abdiel Arroyo (LD Alajuelense), Rolando Blackburn (Chorrillo), Ismael Diaz (Deportivo La Coruna), Jose Fajardo (CA Independiente), Roberto Nurse (Mineros Zacatecas),Blas Perez (Municipal), Luis Tejada (Sports Boys), Gabriel Torres (CD Huachipato)

Poland:

Goalkeeper: Bartosz Bialkowski, Lukasz Fabianski, Lukasz Skorupski, Wojciech Szczesny

Defenders: Jan Bednarek, Bartosz Bereszynski, Thiago Cionek, Kamil Glik, Artur Jedrzejczyk, Marcin Kaminski, Tomasz Kedziora, Michal Pazdan, Lukasz Piszczek

Midfielders: Jakub Blaszczykowski, Pawel Dawidowicz, Przemyslaw Frankowski, Jacek Goralski, Maciej Rybus, Sebastian Szymanski, Piotr Zielinski, Szymon Zurkowski

Forwards: Dawid Kownacki, Robert Lewandowski, Arkadiusz Milik, Krzysztof Piatek, Lukasz Teodorczyk, Kamil Wilczek

Portugal:

Goalkeepers: Anthony Lopes (Lyon), Beto (Goztepe), Rui Patrício (Sporting)

Defenders: Antunes (Getafe), Bruno Alves (Rangers), Cédric Soares (Southampton), João Cancelo (Inter), José Fonte (Dalian Yifang), Luís Neto (Fenerbahçe), Mário Rui (Nápoles), Nélson Semedo (Barcelona), Pepe (Besiktas), Raphael Guerreiro (Dortmund), Ricardo Pereira (FC Porto), Rolando (Marselha) e Rúben Dias (Benfica)

Midfielders: Adrien Silva (Leicester), André Gomes (Barcelona), Bruno Fernandes (Sporting), João Mário (West Ham), João Moutinho (Mónaco), Manuel Fernandes (Lokomotiv), Rúben Neves (Wolverhampton), Sérgio Oliveira (FC Porto), William Carvalho (Sporting)

Forwards: André Silva (Milan), Bernardo Silva (Manchester City), Cristiano Ronaldo (Real Madrid), Éder (Lokomotiv), Gelson Martins (Sporting), Gonçalo Guedes (Valência), Nani (Lazio), Paulinho (SC Braga), Ricardo Quaresma (Besiktas), Ronny Lopes (Mónaco)

Big name Omissions: Renato Sanches

Russia:

Goalkeepers: Igor Akinfeev, Vladimir Gabulov, Soslan Dzhanaev, Andrey Lunev

Defenders: Vladimir Granat, Sergei Ignashevich, Fedor Kudryashov, Ilya Kutepov, Roman Neustadter, Konstantin Rausch, Andrey Semenov, Igor Smolnikov, Mario Fernandes

Midfielders: Yuri Gazinskiy, Alexsandr Golovin, Alan Dzagoev, Alexsandr Erokhin, Yuri Zhirkov, Daler Kuzyaev , Roman Zobnin, Alexsandr Samedov, Anton Miranchuk, Alexsandr Tashaev, Denis Cheryshev

Forwards: Artem Dzyuba, Aleksey Miranchuk, Fedor Smolov, Fedor Chalov.

Big name omission: Aleksandr Kokorin

South Korea:

Goalkeepers: Kim Seunggyu, Kim Jinhyeon, Cho Hyeonwoo

Defenders: Kim Younggwon, Jang Hyunsoo, Jeong Seunghyeon, Yun Yeongseon, Kwon Kyungwon, Oh Bansuk, Kim Jinsu, Kim Minwoo

Midfielders: Park Jooho, Hong Chul, Go Yohan, Lee Yong, Ki Sungyueng, Jeong Wooyoung, Kwon Changhoon, Ju Sejong, Koo Jacheol, Lee Jaesung, Lee Seungwoo, Moon Sunmin

Forwards: Lee Chungyong, Kim Shinwook, Son Heungmin, Hwang Heechan, Lee Keunho

Tunisia:

Goalkeepers: Aymen Mathlouthi, Mouez Hassen, Farouk Ben Mustapha, Moez Ben Cherifia

Defenders: Syam Ben Youssef, Yohan Benalouane, Yassine Meriah, Bilel Mohsni, Hamdi Nagguez, Ali Maaloul, Khalil Chemmam, Oussema Haddadi, Dylan Bronn

Midfielder: Ellyes Skhiri, Ferjani Sassi, Karim Laribi, Ahmed Khalil, Mohamed Amine Ben Amor, Ghailene Chaalali, Mohamed Larbi, Anice Bardi, Saif-Eddine Khaoui, Saber Khalifa

Forwards: Naim Sliti, Fakhreddine Ben Youssef, Whabi Khazri, Bassem Srarfi, Ahmed Akaichi