Russia coach Guus Hiddink is unsure whether to bring playmaker Andrei Arshavin in to his starting line-up for the crunch Group D clash with Sweden on Wednesday.
The Zenit St Petersburg star was suspended for Russia's first two games at the tournament, but Hiddink is unwilling to make many changes from the side that beat Greece 1-0 in their last match.
"There is a lack of game fitness, game rhythm, because he has not played many games recently," said the Dutchman. "I don't know if he will start."
Hiddink also has injury doubts over Yuri Zhirkov and Diniyar Bilyaletdinov, adding: "They have practised and we will see if they are fit enough to start. They did very slight training on Monday.
"When a team wants to make progress then it must be a habit, as it is a habit in other teams, to play tough games every three or four days.
"It won't work every day if you try to quarrel with players when there is no reason to but sometimes I will do it, maybe individually if necessary."