The Broncos placed Callahan (knee) on injured reserve Wednesday.
Callahan injured his knee in the Broncos' Week 8 matchup with Washington, and he is expected to miss at least a few weeks. Denver anticipates Callahan will be able to return this season, as the injury likely doesn't require surgery. Expect Kyle Fuller and Nate Hairston to see extended opportunities for the Broncos' secondary until Callahan is able to return from injured reserve.