Starting offensive tackle Willie Colon suffered a torn triceps muscle late in Sunday's game and will undergo likely season-ending surgery on Tuesday, his agent told the Pittsburgh Post-Gazette.
Colon missed the entire 2010 season with an Achilles injury, and now is the casualty of another season-ending injury after signing a five-year, $29 million contract this summer. He was a key member on what is quickly becoming a patchwork offensive line protecting quarterback Ben Roethlisberger.
Rookie Marcus Gilbert and 2010 draft choice Chris Scott are listed behind Colon on the depth chart. A pair of former Steelers offensive tackles, veterans Flozell Adams and Max Starks were released during training camp and remain free agents.