PITTSFORD, N.Y. -- Bills quarterback Craig Nall hurt his left hamstring in practice Saturday, and said it was too early to determine the severity of the injury because of potential swelling.
"It feels OK, just going to play it smart," Nall told The Associated Press. "It's just doing everything we can so I can get back out on the field as soon as possible."
He added he will benefit by getting a day of rest by sitting out a scheduled walkthrough session Sunday before Buffalo holds its first practice with full pads Monday.
"We're hoping it's nothing significant, but we won't know for a couple of days," coach Dick Jauron said.
Competing with J.P. Losman and Kelly Holcomb for the Bills' starting job, Nall was hurt in the final 15 minutes of the second of Buffalo's two training camp practices of the day. He pulled up in pain while scrambling in the backfield during 11-on-11 drills.
"I just felt a little tweak in the hamstring when I just kind of changed direction and went to take off full speed," Nall said, noting he's previously injured his right hamstring. "I knew better than to try to tough it out and keep going."
Careful not to place too much weight on his left leg, he immediately went to team trainer Bud Carpenter. After a brief discussion, Nall pulled the front of his jersey over his head to hide his emotions before being escorted by an assistant trainer to the locker room.
Signed as a free agent in March, Nall is a four-year NFL veteran who appeared in six career games as a second- and third-stringer in Green Bay.
Rookie third-round pick, cornerback Ashton Youboty, was held out of the afternoon practice Saturday after tweaking his hamstring in the morning session.