The 21-year-old Dynamo Moscow forward, who featured as a substitute in the 4-1 win over Czech Republic, suffered a hamstring tear in training on ThursdayAleksandr Kokorin has been ruled out of Russia's Euro 2012 Group A clash with Greece through injury, and there is now real concern that he could miss the remainder of the tournament.
The Dynamo Moscow striker pulled up with a hamstring problem in training in Sulejowek on Thursday and subsequent scans have revealed a tear.
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The versatile forward, who can also play out wide, saw six minutes of game time at the end of the opening-day rout of Czech Republic but he was an unused substitute in subsequent draw with co-hosts Poland.
Dick Advocaat's men need only a point against Greece to guarantee a place in the quarter-finals.