Paris St Germain said forward Kylian Mbappe suffered a foot injury during training on Monday, casting doubts over his participation in the return leg of their Champions League last-16 tie against Real Madrid on Wednesday.
Mbappe scored a stunning individual goal in stoppage time to give PSG a 1-0 home victory over Madrid in the first leg in February.
"Kylian Mbappe suffered a shock to the left foot during training today," PSG said in a statement. "He was treated this afternoon. The clinical examination is reassuring and a new check-in will be made in 24 hours."
The 23-year-old Mbappe missed his side's 1-0 Ligue 1 defeat by Nice on Saturday due to suspension, in which PSG managed just two shots on target.
PSG turned down multiple bids from Madrid for the 23-year-old last year, who can leave as a free agent at the end of the season when his contract expires.