After being limited in practice on Wednesday, Buffalo Bills wide receiver Stevie Johnson took a step backwards on Thursday, reportedly missing practice entirely while making only a perfunctory appearance on a stationary bike.

This is not uncharted territory for Johnson, who was in and out of practices on a weekly basis in 2011 with a groin injury. It's not clear if it's the same groin injury that currently plagues Johnson, but given that he had off-season surgery to correct last year's injury, it's at least very concerning that he's not completely healthy at this point.

There is still very little reason to believe that Johnson won't be available for Sunday's game against the New York Jets, given that he didn't miss a start a year ago. We'll know more about his long-term prognosis when reporters get a chance to speak to head coach Chan Gailey after practice. Still, 'tis the season to worry about things like this, and there is reason to raise an eyebrow over Johnson missing a practice three days before the team's season opener.