Chicago Bears defensive end Lamarr Houston tore his right anterior cruciate ligament while celebrating a sack against the New England Patriots.
Houston had no sacks until Sunday against the New England Patriots.
Houston was signed to a five-year, $35 million contract in March that included $14.9 million in guaranteed money.
"Obviously, Lamarr had built up some frustration from not having a sack yet," Bears general manager Phil Emery said. "We were very pleased with his play against the run and he led our team in hits on the quarterback, but he hadn't had a sack. Obviously, that's a big stat in the NFL. It's awfully big for a free agent coming in. He got his first sack, he let out all of his frustrations and ultimately paid a price for it.
"We're disappointed for him and in him. He knows he made an error. He's come into all of our offices and apologized for his error but ultimately the team paid a price and at the end of the day Lamarr paid a bigger price; he lost the season. So enough said."
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Aaron Wilson covers the Ravens for The Baltimore Sun