The full-back lasted only four minutes at the Stadio Olimpico in this evening’s 2-1 Europa League defeat to Real Betis.
He limped off and initial reports claim there is a sprain to the right knee with potential ligament damage, so if that was confirmed by tests, it would rule him out for some time.
“I don’t wish to seem too pessimistic, but the sensation is not positive,” said Mourinho in his press conference.
This is particularly damaging because Celik and Karsdorp are both right-backs.
Roma spent €7m to purchase Turkey international Celik from LOSC over the summer and so far this season he has made nine appearances between Serie A and the Europa League.