Milan are expected to be without Fikayo Tomori for at least two months after tests showed a myotendinous lesion to the right femoral bicep.
The defender pulled up clutching the back of his thigh during the 2-2 draw with Salernitana on Friday evening.
It immediately became clear that this was a serious issue and he hobbled off in agony at the Stadio Arechi.
Now the medical tests have confirmed a myotendinous lesion to the right femoral bicep.
This type of injury tends to require at least two months out of action, although for now it does not seem as if it will require a surgical intervention.
It is a devastating blow to one of the only remaining players in the squad who had managed to avoid an injury so far this season.
Tomori joins Tommaso Pobega, Pierre Kalulu, Malick Thiaw, Marco Pellegrino, Yunus Musah and Noah Okafor on the treatment table.
This leaves Simon Kjaer as the only fit centre-back in the entire squad.
Get well soon Tomori