The Patriots yesterday released Colvin and linebacker Oscar Lua, a 2007 seventh-round draft choice who spent last season on injured reserve after hurting his knee in an exhibition game.
By cutting the 30-year-old Colvin, the Patriots save $5.8 million on their salary cap as they prepare for the start of free agency Friday at 12:01 a.m.
Colvin's departure, while not unexpected, creates more uncertainty at arguably the Patriots' most uncertain position.
As it stands, the team has only six linebackers scheduled to return next season: starters Adalius Thomas and Mike Vrabel, and reserves Eric Alexander, Larry Izzo, T.J. Slaughter, and Pierre Woods. That number would increase if veterans Tedy Bruschi and Junior Seau, both of whom are free agents, put off retirement.
Colvin started at outside linebacker in the 3-4 alignment, where his main responsibilities were rushing the passer and setting a strong edge to force running plays inside. He would also occasionally drop into pass coverage, although he was considered at his best when moving forward. At times, he privately became frustrated when he felt he wasn't being employed in an attacking role.
Teams that use a 3-4 base often have trouble finding an outside linebacker who fits their system, sometimes relying on a defensive end leaving a 4-3 scheme to make the transition. Colvin successfully made the switch after playing end in the Bears' 4-3 defense from 1999-2002.
The Patriots could fill the outside spot with Thomas, their top free agent addition last offseason. Thomas opened last season playing inside linebacker, but moved outside after Colvin was lost for the season Nov. 25, and played arguably his best game in the Super Bowl.
But if the Patriots move Thomas to a permanent role outside, it leaves them with a significant gap in the middle of their defense. A switch to more 4-3 schemes could alleviate that issue.
