The Spain striker, who scored at Southampton and Hull City earlier this month, came on as a late substitute for hat-trick hero Samuel Eto'o but did not last the distance due to a damage to his lateral knee ligament which means he faces "weeks" out.
Demba Ba will be given an opportunity in Torres' absence, Mourinho insisted. "It's time for Demba," he said. "It's a pity because Nando (Torres) is in a good moment, but it's time for Demba.
"Demba had a fantastic week; (it was) very difficult for me to leave him out of selection because he worked very, very well. (The) next matches (are) for Demba or Samuel. Let's go."