Colts LT Anthony Castonzo announced his retirement.
Castonzo retires after ten years protecting the blind side of Colts quarterbacks. He was placed on injured reserve last month after season-ending ankle surgery after struggling through injuries for much of the year, including a knee ailment that limited his practice participation in November. Castonzo, who signed a two-year, $33 million contract extension with the Colts last March, was drafted by the team with the 22nd pick in the 2011 NFL draft. Castonzo’s retirement, which frees up around $16 million in cap space, is a major blow to the Indianapolis offensive line -- one the team will need to address in the draft or through free agency.