The Uruguay striker left the pitch on the stroke of halftime holding his thigh, soon after scoring with a penalty in the 42nd minute.
"I don’t have good news. We have to wait,” said coach Thomas Tuchel three days before PSG take on United at Old Trafford in a Champions League last-16 first-leg match.
Tuchel's side will also be missing Brazil striker Neymar, who has been ruled out with a foot injury.
“I honestly don’t know if Cavani will play. Yes it is worrying. We don’t have another Edi like we don’t have another Neymar," Tuchel added.
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(Reporting by Julien Pretot; Editing by Ed Osmond)
