Poland defender Damien Perquis and midfielders Eugen Polanski and Dariusz Dudka could be in doubt for the Euro 2012 co-hosts' must win final group match with the Czech Republic after suffering injuries in Tuesday's 1-1 draw with Group A leaders Russia.
"Perquis has a deep cut on his shin. Polanski has a heavily-bruised knee and Dudka has a recurrence of an abdominal strain," team media director and former international Tomasz Rzasa told the Polish news agency PAP.
The three players were to undergo tests later on Wednesday.
"We'll only be able to say more after that," said Rzasa.
Poland have to beat the Czechs to reach the quarter-finals as they have two points while their opponents have three after beating Greece 2-1, also on Tuesday.
There had been injury fears over Perquis even before the tournament, after he broke an elbow in action with his French club Sochaux.
The 28-year-old left the pitch briefly during the first half against Russia for treatment to a bloodied shin, but he was able to return to the action and saw out the match.
Polanski had his hopes of his debut Poland goal dashed when he was ruled offside after an 18th-minute strike.
The 26-year-old Mainz midfielder was substituted 10 minutes from time.
Dudka, meanwhile, had been on the bench for last Friday's 1-1 opening match against Greece, but was named in the starting line up against Russia.
The Auxerre midfielder, who is 28, was taken off in the 73rd minute.