Gailey regards both as game-time decisions for the winless Bills (0-6).
Byrd has a thigh injury and worked out on a limited basis Thursday, a day after missing practice. He's yet to miss a game this season despite having minor hip surgery in August.
McGee was also limited in practice, and has missed three games after having surgery to repair a nerve problem.
Starting left tackle Demetrius Bell returned to practice Thursday. Gailey says Bell is expected to play, and was given Wednesday off to rest his surgically repaired knee.