Fellaini could miss Liverpool clash due to injury on Belgium duty
The Manchester United man left the field after 29 minutes and appeared to be suffering from considerable discomfort in his left knee, with coach Roberto Martinez instantly signalling for him to be substituted.
The condition of the playing field at the Stadion Grbavica would not have helped the situation with the muddy, wet conditions causing problems for a number of players.
It is a problem that Mourinho could have done without at this time, given that United's next Premier League game is a tricky trip to Anfield next Saturday to face Liverpool. With Paul Pogba already out injured, United have been forced to rely heavily on former Everton man Fellaini, who has featured in eight games this season for the Red Devils.
Marouane Fellaini injury update. Fears for ligament damage.Roberto Martínez: "We are all worried about Fellaini. We fear that there's ligament damage." #mufc https://t.co/HgnC8MtgQw