LONDON -- Chelsea interim manager Guus Hiddink has said Kurt Zouma's knee injury looks "bad."

But Hiddink said he would not speculate on how long the France international might be out for until he had undergone scans.

Zouma landed awkwardly after battling for an aerial ball in the second half of Chelsea's 1-1 draw with Manchester United at Stamford Bridge, jarring his knee and being stretchered off after 58 minutes.

Replays of the incident, which left Zouma yelling in pain, raised fears that his season could be over.