Moss exited Tuesday's practice due to a hamstring injury, Sal Capaccio of WGR Sports Radio 550 Buffalo reports.
Moss spent the offseason in recovery mode from a left ankle injury suffered in the Bills' divisional-round win against the Colts that required surgery in mid-January. He opened training camp as a limited practice participant, but he quickly was handling every rep and mentioned that he had cleared the mental aspect of running on the ankle in question. Now, Moss is tending to a new injury, which could impact his availability for Friday's preseason game at Detroit. The situation also may allow Devin Singletary to get a leg up in Buffalo's backfield competition.