Denver Broncos linebacker Danny Trevathan has a fracture just below his left knee joint and will miss six to eight weeks, the team announced Tuesday.

Trevathan, who had an MRI after he was carted off the field during Tuesday morning's practice, suffered a medial tibial impaction fracture.

"They told me that my ACL and MCL are fine, but that I have a fracture in my knee," Trevathan told ESPN's Josina Anderson. "The doctor told me I was going to be out four to eight weeks, but I told him four to six. I'm not tripping. I will bounce back. I'm a soldier."

Trevathan fell to the ground in pursuit of a run play during a full-team drill in the Broncos' fully padded practice. It was unclear where Trevathan made contact with another player, but backup center Will Montgomery rolled over the top of Trevathan when the two hit the ground.

Trevathan immediately grabbed for his knee and was down for several minutes before he was taken to the locker room.

"You never like to see any player go down," coach John Fox said.

The third-year linebacker, who led the Broncos with 124 tackles last season, is one of the most important players in defensive coordinator Jack Del Rio's scheme.