Posted by ESPN.com's Tim Griffin
Colorado freshman Nick Kasa will be idled for at least three weeks with a torn MCL in his left knee.
The injury will more likely sideline the Buffaloes' top 2009 recruit for 6-8 weeks, although team officials still hold out hope the injury might not be as severe as originally diagnosed.
Kasa told the Denver Post that surgery remains a possibility, but that also won't be determined until the swelling goes down.
"It's definitely a pretty bad setback for me," Kasa told reporters Wednesday morning as he watched the practice with his injured knee immobilized. "I want to play. I think everybody wants to play. I just have to take it in stride and do what I can to get back as fast as I can."
If the injury stretches out through four or more weeks, a redshirt could be likely for the 6-foot-7, 270-pound Kasa. He was in the mix for immediate playing time after coming into the program as the most heralded addition in Colorado's 2009 recruiting class.
The injury occurred during a two-man pass rush drill when an offensive guard blocking the other defensive player unintentionally rolled into Kasa's left side. Kasa told the Denver Post he didn't see it coming.
"The last week, I really started to catch on to things. Everything was going good in practice," Kasa told the Post. "I've got to be out now, especially for CSU (the Buffaloes' Sept. 6 opener at Folsom Field). I really wanted to play in that game. I just have to stay positive."
Marquez Herrod is expected to be the starting defensive end on the other side. Sophomores Conrad Obi and LaGrone Shields have the inside track for playing time, followed by sophomore David Goldberg and freshman Nick O'Neill.