Playmaker Rosicky's precise passing and ability to raise the game's tempo helped the Czechs take an early two-goal lead against Greece on Tuesday but he had to come off at halftime.
"We will see tomorrow," Bilek said of Rosicky, who missed the Czechs final two warm-up games with a calf injury.
"It was his Achilles heel but we hope he is fit for the third match because he is our key player."
Bilek also bemoaned Petr Cech's blunder that led to the Greek goal but said his team responded the way he wanted after a crushing 4-1 defeat by the Russians in their opener.
"There is not one player on the team I would not praise," Bilek said. "We wanted to attack even more but it was difficult when Rosicky left."
"In this match we wanted to close the defence," Bilek said. "That is why Jiracek played in a position that is not usual for him. He performed very well and was making runs along the line and really getting in to the game."
