From Zahabi on sherdog.com:
“He was sparring today and he hurt his knee,” Zahabi confirmed to Sherdog.com. “I had a feeling it was bad, but then, once he cooled down, he started limping. There’s no way he would be able to fight.”
According to Zahabi, the injury is currently being classified as a “bad sprain” following a trip to the doctor. The trainer said that the sprain would significantly limit St. Pierre’s ability to punch or kick.
St. Pierre’s injury occurred during a shoot boxing session, which mainly consists of standup sparring but also incorporates takedowns. Asked exactly how St. Pierre hurt his knee, Zahabi said that he could not adequately describe the sequence of events over the phone due to the complexity of the activity.
“It was a weird thing. I can’t really explain it. I’d have to show you,” said Zahabi.