PITTSFORD, N.Y. -- Buffalo Bills rookie quarterback J.P. Losman hurt his left ankle during practice Tuesday and had to be carted off the field.
Bills president Tom Donahoe didn't update Losman's condition, as the player was still having tests a half-hour after practice ended. The injury initially appeared serious, as Losman was unable to put any weight on his injured leg as he was helped into a cart and driven to the locker room.
Losman, the second of Buffalo's two first-round picks, was hurt two hours into practice when he was finishing a run up the right side during a two-minute drill. As he was pulling up, cornerback Troy Vincent laid a shoulder into Losman's upper body, knocking him over.
Losman got up and immediately started limping, before falling back to the ground. Trainers attended to him for about five minutes on the field, and Vincent came over and shook his hand.
Calling the collision an accident, coach Mike Mularkey said: "Troy's not going to try to hurt anybody and J.P., he loosened up right there at the end - you can't do that."
Vincent said the two collided when Losman attempted to cut back into the middle.
"I didn't hit him to tackle him, he was cutting back and I just happened to catch the blade of his shoulder pad," Vincent said. "I didn't know he had fallen. I just continued to run, and when I looked back, he was on the ground."
Selected 22nd overall out of Tulane, Losman is being groomed as Drew Bledsoe's eventual successor.
In Buffalo's two preseason games, he went a combined 9-of-11 for 78 yards, and is second on the team in rushing with 80 yards on seven carries. Losman has also engineered three scoring drives - all ending in field goals - in the five series he's been in.
Bills starting left tackle Jonas Jennings also left practice after twisting his right ankle. Jennings was still limping slightly, but able to take part in a scheduled fire prevention promotion after practice.
Jennings expects to resume practicing Wednesday.
Receiver Eric Moulds watched most of practice from the sideline, nursing a sore chest, which he hurt in Saturday's 16-15 preseason loss to Tennessee. Moulds said he expects to be back at practice on Wednesday.
Starting running back Travis Henry (bruised ribs) missed his second straight practice and said he doesn't expect to play Saturday in a preseason game at Indianapolis. Punter Brian Moorman returned to practice for the first time since hurting his left leg last Wednesday.
Backup offensive lineman Marcus Price practiced on a limited basis for the first time since hurting a toe on his left foot in Buffalo's preseason-opening win against Denver on Aug. 15.
Cornerback Terrence McGee and safety Mark Graham did not practice.