PITTSFORD, N.Y. — Buffalo Bills backup quarterback J.P. Losman was held out of practice tonight, a day after jamming the thumb on his throwing hand.

Losman's right thumb was heavily wrapped as he watched practice, but the extent of the injury was not immediately known. Losman indicated earlier in the day that the injury wasn't severe.

Coach Dick Jauron was expected to update reporters on Losman's status following practice.

Losman was hurt following through on a pass attempt, when his thumb struck a teammate during the Bills' first practice in full pads Monday. The second of Buffalo's two 2004 first-round picks, Losman lost his starting job to rookie third-round pick Trent Edwards last season.