The Indianapolis Colts exercised the fifth-year option on left tackle Anthony Castonzo, according to reports Monday.
Colts general manager Ryan Grigson confirmed the decision to the Indianapolis Star.
The option, worth $7.438 million for 2015, is part of the four-year, $8 million contract Castonzo signed after being selected with the 22nd overall pick in the 2011 NFL Draft.
Castonzo, 25, has been a mainstay on the offensive line the past three seasons, starting 47 games including the playoffs. He missed four games as a rookie with an ankle injury. He only gave four up sacks while starting every game last season.