The season could be over for Walter Samuel, as the initial diagnosis for the Inter defender suggests torn cruciate ligaments.
The 32-year-old Argentine was stretchered off in agony during the 1-1 draw with Brescia on Saturday evening.
He will require further tests to ascertain the extent of the damage, but the initial word coming out from the club's medical staff is not reassuring.
There are fears he has torn the posterior cruciate ligaments in his right knee.
The incident was an accidental clash of knees with Andrea Caracciolo, but the impact made his knee move backwards when the leg was standing straight.
If the ligament damage is confirmed, then Samuel could well be out for the rest of the season.
To make matters worse, he had already suffered a similar injury in his left knee during the Milan derby in December 2007 and took nine months to fully recover from that.