Barcelona coach Luis Enrique admits major concerns over Rafinha's injury.
The midfielder was stretchered off during their 1-1 draw at Champions League opponents Roma.
Enrique said: "There's no doubt that that was the worst thing about tonight.
“I'd go as far as to say that I think it affected the pace of the match. We're waiting on tomorrow's results, but it doesn't look good. And that's really nasty news for us."