Borussia Dortmund midfielder Marco Reus will undergo further evaluation on his left foot after leaving Tuesday's German Cup match in the first half.
Reus was injured as Dynamo Dresden's Dennis Erdmann shoved him near the penalty area. The 25-year-old hobbled off the pitch before receiving treatment on the sideline.
A report on Dortmund's website said Reus would be evaluated on Wednesday morning.
It's the latest setback for Reus, who missed the World Cup with an injury to his left ankle, then was sidelined again in November after injuring his right ankle.
Reus had scored in five straight games in all competitions before Tuesday's cup match.
Without him, Dortmund were still able to advance to the quarterfinals by ousting third-tier Dynamo Dresden 2-0 on two goals from Ciro Immobile.
"It wasn't an easy game," Immobile said. "When an opponent is so strong in defense and is so compact it is difficult for any team. The most important thing was to win this game and to take another step towards Berlin."
Dortmund boss Jurgen Klopp said he was "satisfied" with the victory.
"The match was a test of character for us," he said. "We tried to do a few things, we could have been cleverer and could have made it easier for ourselves. We could have worked together better when going for the second ball. It was difficult to play here, every time we got the ball we had problems on this pitch.
"But when you win 2-0 after 90 minutes, then everything is all right."