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Colts exercise Castonzo's option

Anthony Castonzo will be protecting Andrew Luck's blind side for at least two more seasons.

To no surprise, the Indianapolis Colts picked up Castonzo's fifth-year contract option of $7.438 million for 2015, the NFLPA confirmed Monday on its website.

CBS Sports reported earlier Monday that the Colts had exercised the option on the left tackle.

Castonzo, 25, gave up only four sacks while starting every game last season, his third with the Colts.

A first-round draft selection in 2011, Castonzo has appeared in 44 games (all starts) with Indianapolis.