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Friday, August 2, 2013
Bills practice update

By Mike Rodak

The Buffalo Bills returned to the practice field on Friday, and the biggest news was wide receiver Stevie Johnson leaving with a left hamstring injury. Bills coach Doug Marrone said after practice that he did not know the severity of the injury, and that Johnson will be evaluated by Buffalo's doctors. The NFL Network reported Johnson will have an MRI.

"It would be a major concern when we talk about it during the season, but right now, I think a veteran player that has proven himself, we'll just see what the doctors say," Marrone said.

Tight end Mike Caussin also left practice Friday with a hip injury.

Otherwise, here are some observations from the practice, which was the Bills' fifth of training camp: