Russia coach Guus Hiddink has admitted that Pavel Pogrebnyak could miss Euro 2008 after suffering a knee injury on Wednesday.
The Zenit St Petersburg player put Russia ahead in their friendly against Serbia with a superb free-kick but then twisted his knee and had to be replaced by Roman Pavlyuchenko.
Hiddink is determined to give Pogrebnyak as much time as possible after confirming his final 23-man squad prior to the match.
However he accepts he may have to call up a replacement if it does not look as if Pogrebnyak is going to recover.
"Pogrebnyak suffered a relatively serious injury," said Hiddink. "He has problems with his knee and meniscus.
"I'm not set to call anybody up to replace Pavel (Pogrebnyak) right now but may change my decision later.
"Now we shall wait and watch how he recovers."
Pogrebnyak missed out on Zenit St Petersburg's Uefa Cup final triumph over Rangers earlier this month due to suspension.