United States midfielder Christian Pulisic limped off with another injury in AC Milan's win against Como on Tuesday.
Pulisic, who had only just returned from a torn muscle in his right calf, held his left calf after a clash with Como defender Marc-Oliver Kempf just before half-time in the Serie A clash.
The 26-year-old was seen to by Milan medical staff soon after and substituted. While he limped off the field on his own accord, Pulisic is now a doubt for the crucial game against Juventus on Saturday.