Reed (foot) was limited during Tuesday's practice, Tim Twentyman of the Lions' official site reports.
Reed logged 89 snaps in Sunday's 31-30 overtime victory over the Saints, finishing with a team-high 10 tackles (seven solo), as well as a pass defense. If Reed can't suit up for Thursday's meeting with Buffalo, then Roger McCreary or Keith Abney could see an uptick in snaps at outside corner opposite Rock Ya-Sin.