Manchester United summer signing Eric Bailly suffered a fresh knee blow during the Red Devils' 2-1 victory over Crystal Palace on Wednesday night (14 December). Jose Mourinho is still uncertain about the severity of the issue but revealed that it was not a recurrence of his recent serious knee injury as this time the problem is on the other one.

Bailly picked up the injury earlier in the first-half after starting in the right-back to cover the absence of suspended Antonio Valencia. However, the Manchester United versatile defender managed to return to the pitch and enjoyed an impressive performance until being forced to leave his place to Matteo Darmian in the 52nd minute of the game.

The substitution raised alarm bells at Old Trafford as the former Villarreal defender only returned to action from the serious knee ligaments injury he sustained during the 4-0 defeat to Chelsea in October.

But Mourinho explained that it was not a recurrence of that injury, while praising the 22-year-old "special guy" for his great commitment.

"The only thing I can say is that it is not the same knee. He had an injury in the right knee and he recovered fantastically well. Now it is the left knee. I don't know really what he has, but let us see and wait. He could resist for so long. I would say for about 75 minutes he could resist. He is a special guy and his pain level is really high," Mourinho said to MUTV.

Manchester United visit West Brom on Saturday before the busy Christmas period but Mourinho insisted to BT Sport that he doesn't know whether the defender will be available for those games.

"We don't know [yet]. It is not the same knee, it is the other one. It is the left knee. So he is not coming back to a previous injury. Of course he has a problem with another dimension but he showed amazing character to try and try, and try until his limit."