Germany coach Joachim Low was unsure if Sami Khedira or Mario Gomez would be available for his side's Euro 2016 semi-final.
Khedira lasted just 16 minutes of Germany's quarter-final victory over Italy in Bordeaux on Saturday.
"Sami – it's not too positive to have to bring him off after 15 minutes in such a game, he had a problem with his hamstring," he said.
"I don't know if he will heal before Thursday.
"Gomez has a problem as well but I don't much about that."
"France are the favourites, they are the hosts and they have a great side with individual quality," he said.
"Iceland have surprised us, they are well organised in defence.
"It won't be easy for France against such enthusiastic opposition but I think if France put their quality on the pitch they will get to the semi-finals.
"If you're in the semi the goal is to reach the final so I think now we have to focus on recovering.
"A game like this affects the body, we have to make sure to recover the players and we want more."
