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Bills in wait-and-see mode with RB LeSean McCoy

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McCoy injury could be huge loss for Bills (1:47)

ESPN Bills reporter Mike Rodak says not much is known about LeSean McCoy's hamstring injury, which forced him out of practice, but it would be a huge loss if it's serious. (1:47)

ORCHARD PARK, N.Y. -- Bills running back LeSean McCoy injured his hamstring during Wednesday's practice and did not return.

The team is awaiting further evaluation before determining whether McCoy can play Sunday against the Dolphins.

"He was tight in the hamstring, so we'll see what happens with our medical evaluation and all that," Bills coach Rex Ryan said after practice. "I'm not going to look into [his availability Sunday], but we'll see how he comes back."

Quarterback Tyrod Taylor said he did not recall when McCoy's injury occurred but said he noticed the running back's reps seemed limited during practice.

McCoy ranks second in the NFL this season with 587 rushing yards. He has averaged 6.4 yards per carry over the Bills' current four-game winning streak, amassing 470 rushing yards during that span.

If McCoy cannot play Sunday, backup Mike Gillislee would be expected to take most of the carries.

"We feel good about the guys that we do have, but that's assuming he won't play," Ryan said. "We'll see how it goes."