Michy Batshuayi could miss the World Cup with Belgium after suffering an injury in Borussia Dortmund’s 2-0 loss at Schalke on Sunday.
The striker had to be removed from the action on a stretcher in the second half with what may be serious ligament damage.
The World Cup begins in two months and BVB boss Peter Stoger fears Batshuayi has suffered a long-term injury.
“I didn’t think it looked like the kind of injury that he would be back from quickly,” Stoger told Dortmund’s official website.
“I hope, of course, that I’m mistaken. I can’t yet say anything specific, other than the fact that he’s in pain and will now be examined in more detail. Hopefully it’s not as bad as it looks.”
The 24-year-old striker joined Dortmund on loan for the rest of the season from Chelsea in January and has impressed in Germany with nine goals in 14 appearances.
The forward seemed set to be included in Belgium boss Roberto Martinez’s squad for the tournament in Russia but it remains to be seen if he will be able to recover in time.
Belgium have been draw in Group G alongside England, Panama and Tunisia. The Red Devils open their account against Central American nation Panama, who are making their debut in the tournament, on June 18 in Sochi.
Belgium are 1.80 to win Group G and 12.00 to win the tournament outright, with Germany and Brazil currently rated as the 5.50 joint favourites.