Robert Mathis signs 1-year extension

INDIANAPOLIS -- The Colts have signed linebacker Robert Mathis to a one-year contract extension through the 2016 season, the team announced Tuesday.

Mathis, who was under contract through 2015 before signing the extension, can make as much as $6 million in 2016 with the extension, according to a source.

He signed a four-year, $36 million extension with the Colts in 2012.

Mathis was suspended the first four games of the season for using performance-enhancing drugs, and his season ended when he tore his Achilles while working out in Atlanta during his suspension.

The 33-year-old Mathis is coming off a 2013 season in which he led the NFL in sacks with 19.5.

The Colts also announced that they signed cornerback Jalil Brown to the active roster and receiver Chandler Jones and linebacker Rob Ruggiero to the practice squad.