Colorado will be without its starting left tackle for the rest of 2015.
"It is very unfortunate to lose Jeromy. He is a fine young man and was definitely playing well so we're going to miss him," Colorado coach Mike MacIntyre said via BuffStampede.com.
Irwin, a redshirt junior, is expected to be replaced by Sam Kronshage at left tackle. Irwin was one of Colorado's best offensive linemen entering the 2015 season.
"Sam is very capable, he'll do a good job. It is not like we're throwing a guy in there that hasn't played at all," MacIntyre said. "He is 20 years old, he is not some young 18 year old. Sam will scrap, claw and do whatever it takes to stop a guy."
The ACL is Irwin's second severe injury in his Colorado career. He missed the 2013 season because of a foot injury and MacIntyre things he has a good shot of getting a medical redshirt for an additional season in 2017 if he wants it.
"I would definitely think Jeromy will get another year so in 2017 when he is playing as a senior, I'll love having him," MacIntyre said. "But for now, I hate losing him."
Colorado beat UMass on Saturday 48-14. It was Colorado's first win since beating Hawaii on September 20, 2014.
For more Colorado news, visit BuffStampede.com.
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