Bayer Leverkusen are set to be without midfielder Malik Tillman for the second leg of their Champions League knock-out play-offs against Olympiacos on Tuesday.
"It's a bit difficult when it comes to Malik. It's not yet fully decided (whether he can play) but it's not looking good," coach Kasper Hjulmand said in a news conference on Monday.
The 23-year-old was hit on the right ankle by Union Berlin's Stanley Nsoki in the third minute of Saturday's 1-0 defeat. Tillman played through the game but left the stadium limping.
"We have a short training session and a medical check tomorrow, then we'll decide," Hjulmand said.
Leverkusen have a 2-0 advantage from the first leg but the coach warned against being too complacent.
"It's a good result but it's also dangerous to think it will be easy. It's not easy. We're taking this task very seriously," he said.
The winner of the match-up advances to the last 16 and will face either Bayern Munich or Arsenal.