Radja Nainggolan limped off during the Milan Derby with a sprained left ankle and is in doubt to face Barcelona.
The midfielder collided with Lucas Biglia and tried to play on, but eventually had to go off.
Initial reports suggest the Belgium international has sprained his left ankle.
More tests are needed, but it’s going to be very difficult for him to shake this off in time for Wednesday’s Champions League showdown with Barcelona.
The Blaugrana are already missing Lionel Messi for both legs against Inter after fracturing his arm during the win over Levante last night.