Belgium captain Vincent Kompany has suffered a groin injury three days before his side's World Cup clash with Russia.
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The Manchester City defender missed training on Thursday with a "slight groin strain," Red Devils coach Marc Wilmots said.
Wilmots wrote on his official Twitter account: "No @VincentKompany at training today, slight strain in the groin. He is working individually with medical staff!''
Geen @VincentKompany op training vandaag, lichte verrekking aan de lies. Hij werkt individueel met medische staf! #belrus #WorldCup2014
- Marc Wilmots (@WilmotsMarc) June 19, 2014
Belgium defender Thomas Vermaelen, though, is hopeful Kompany will return in time for the Russia clash.
''I'm counting on him to be there," he said.
Eden Hazard, meanwhile, made a return to training and showed no ill effects from a toe contusion sustained in Tuesday's 2-1 victory over Algeria.
Second-choice goalkeeper Simon Mignolet, however, did not train with the rest of the goalkeepers for a second day running, suffering from a hand injury.
Victory on Sunday over Russia, who were held 1-1 in their opening game with South Korea, would book Wilmots' side's place in the next round.
Information from Associated Press was used in this report