Ian Rapoport of the NFL Network reports that a source told him McCoy "is believed to have torn" the Achilles in his left foot.
Speaking with the media after Tuesday's practice, Seahawks head coach Pete Carroll said the injury seemed serious. “If it is what they think it is, it’s just a real heartbreaker,” Carroll added. “He worked so hard to get back.”
McCoy was competing for the backup spot behind veteran Zach Miller.
McCoy was a sixth round pick in 2010 out of USC, where he played under Carroll.
McCoy appeared in every game for the Seahawks in 2011 and 2012, recording 31 catches for 437 yards with three touchdowns.
- Dan Gartland