Czech Republic coach Michal Bilek is hoping that captain Tomas Rosicky recovers from the Achilles injury he sustained against Greece in time for the final Group A game against Poland.
The Czechs, who secured their first points at Euro 2012 with a 2-1 win, were already 2-0 ahead before the Arsenal player came off at half-time.
"We will see on Wednesday what the extent of the problem is," Bilek said.
"He's important. We missed him in the second half as he's a key player."
The Czechs were two ahead inside six minutes thanks to goals from Petr Jiracek and Vaclav Pilar.
Substitute Fanis Gekas reduced the deficit after the break when he capitalised on an error by Chelsea keeper Petr Cech, but the Greeks rarely threatened the opposition goal during the match.
Bilek added: "It was a great start and this time we were fortunate enough to score two goals.
"In the first half we were great, our combinations were good, we were dangerous and the goals proved that.
"The second half was complicated because Rosicky could not play on and it took us time to get back in the game.
"We conceded a really bad goal, which gave Greece hope, but we didn't allow them any clear chances. We defended well and are very happy that our hopes are still alive.
"The pressure on us was great and we knew if we lost it was the end for us but we showed our strength and we won."
Of Cech's mistake, Bilek said: "It was a mistake. Petr didn't communicate with Sivok and it was an unnecessary goal to concede."
Greece were without their first-choice centre-halves, Sokratis Papastathopoulos and Avraam Papadopoulos, because of suspension and injury. Coach Fernando Santos believes their absence contributed to his side's downfall.
He said: "It was a game which started really badly for us.
"At the start we conceded two goals, although we had been warned that they would start quickly. We knew they would put pressure on us but we failed to respond.
"The Greek defence had only conceded four goals in 10 competitive games, and now we have conceded three in just two games.
"Unfortunately the first 10 minutes really cost us. It was difficult to come back, we did everything possible to get an equaliser but we didn't make it."