Group H is so close that one or two players could be the difference between progression and an early exit putting the pressure on the coaches as they named their final squads.
The Japanese squad produced the most surprises with Asano and Ideguchi, the goal scorers responsible for sending Japan through to the World Cup left out.
A shoulder injury has forced Poland to leave Kamil Glik at home while Colombia and Senegal have taken a chance by including injury plagued players.
Poland
Goalkeepers: Bartosz Bialkowski (Ipswich), Lukasz Fabianski (Swansea) and Wojciech Szczesny (Juventus)
Defenders: Jan Bednarek (Southampton), Bartosz Bereszynski (Sampdoria), Thiago Cionek (SPAL), Marcin Kaminski (Stuttgart), Lukasz Piszczek (Borussia Dortmund), Artur Jedrzejczyk and Michal Pazdan (both Legia Warsaw)
Midfielders: Jakub Blaszczykowski (Wolfsburg), Jacek Goralski (Ludogorets), Kamil Grosicki (Hull City), Grzegorz Krychowiak (West Bromwich Albion), Rafal Kurzawa (Gornik Zabrze), Karol Linetty (Sampdoria), Slawomir Peszko (Lechia Gdansk), Maciej Rybus (Lokomotiv Moscow) and Piotr Zielinski (Napoli)
Forwards: Dawid Kownacki (Sampdoria), Robert Lewandowski (Bayern Munich), Arkadiusz Milik (Napoli), Lukasz Teodorczyk (Anderlecht)
Notable absentee: Kamil Glik (AS Monaco)
Senegal
Goalkeepers: Abdoulaye Diallo (Rennes, France); Khadim Ndiaye (Horoya, Guinea); Alfred Gomis (Spal 2013, Italy).
Defenders: Kalidou Koulibaly (Napoli, Italy); Lamine Gassama (Alanyaspor, Turkey); Moussa Wague (Kas Eupen, Belgium); Youssouf Sabaly (Bordeaux, France); Kara Mbodji (Anderlecht, Belgium); Saliou Ciss (Valenciennes, France); Salif Sane (Hanover, Germany).
Midfielders: Cheihkou Kouyate (West Ham, England); Alfred Ndiaye (Wolverhampton, England); Idrissa Gana Gueye (Everton, England); Cheikh Ndoye (Birmingham City, England); Pape Alioune Ndiaye (Stoke, England).
Forwards: Sadio Mane (Liverpool, England); Diafra Sakho (Rennes, France); Moussa Sow (Bursaspor, Turkey), Moussa Konate (Amiens, France); Ismaila Sarr (Rennes, France); Keita Balde (Monaco, France); Mame Biram Diouf (Stoke, England); Mbaye Niang (Torino, Italy)
Injury concern: Kara Mbodji (Anderlecht, Belgium)
Japan
Goalkeepers: Eiji Kawashima (Metz), Masaaki Higashiguchi (Gamba Osaka), Kosuke Nakamura (Kashiwa Reysol)
Defenders: Yuto Nagatomo (Galatasaray), Tomoaki Makino (Urawa Reds), Wataru Endo (Urawa Reds), Maya Yoshida (Southampton), Hiroki Sakai (Marseille), Gotoku Sakai (Hamburg), Gen Shoji (Kashima Antlers), Naomichi Ueda (Kashima Antlers)
Midfielders: Makoto Hasebe (Eintracht Frankfurt), Keisuke Honda (Pachuca), Takashi Inui (Eibar), Shinji Kagawa (Borussia Dortmund), Hotaru Yamaguchi (Cerezo Osaka), Genki Haraguchi (Fortuna Dusseldorf), Takashi Usami (Fortuna Dusseldorf), Gaku Shibasaki (Getafe), Ryota Oshima (Kawasaki Frontale)
Forwards: Shinji Okazaki (Leicester), Yuya Osako (Werder Bremen), Yoshinori Muto (Mainz)
Notable absentees: Takuma Asano (Arsenal, on loan at VfB Stuttgart), Yosuke Ideguchi (Leeds United)
Colombia
Goalkeepers: David Ospina (Arsenal), Camilo Vargas (Deportivo Cali), Jose Fernando Cuadrado (Once Caldas)
Defenders: Cristian Zapata (Milan), Davinson Sanchez (Tottenham), Santiago Arias (PSV Eindhoven), Oscar Murillo (Pachuca), Frank Fabra (Boca Juniors), Johan Mojica (Girona), Yerry Mina (Barcelona)
Midfielders: Wilmar Barrios (Boca Juniors), Carlos Sanchez (Espanyol), Jefferson Lerma (Levante), Jose Izquierdo (Brighton Hove & Albion), James Rodriguez (Bayern Munich), Abel Aguilar (Deportivo Cali), Mateus Uribe (America), Juan Fernando Quintero (River Plate), Juan Guillermo Cuadrado (Juventus)
Forwards: Radamel Falcao Garcia (Monaco), Miguel Borja (Palmeiras), Carlos Bacca (Villarreal), Luis Muriel (Sevilla)
Injury concerns: Cristian Zapata (Milan), Abel Aguilar (Deportivo Cali)
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