Willie Colon injury: Steelers G likely out for season

Starting left guard Willie Colon will probably miss the remainder of the season after aggravating a knee injury, reports Gerry Dulac of the Pittsburgh Post-Gazette.

Colon has started all 51 of the games he's played for Pittsburgh since being drafted in in 2006, but had missed two games games after hurting his knee before attempting to come back Sunday. He re-injured the knee, and had to leave the game. With Colon out, all-pro center Maurkice Pouncey has been playing left guard with backup Doug Legursky starting in his place. First-round pick David DeCastro could play at guard when he returns from his injury after missing the entire season thus far, which would hypothetically allow Pouncey to shift back to his natural position, but DeCastro's timetable for return is unclear.

The Steelers' offensive line has been hampered by injuries: In addition to the switches to compensate for Colon's absence, Mike Adams is out at right tackle, with Kelvin Beachum starting in his place. The makeshift nature of the line showed Sunday against the San Diego Chargers, with Ben Roethlisberger being sacked twice and the team unable to establish a ground game.

This would mark the third straight year Colon's season has ended early due to an injury. In 2010, he missed the whole year after tearing his Achilles tendon in the offseason, and last year he tore his triceps in the first game of the season.