LeSean McCoy Injures Hamstring

Bad news out of Bills camp on Tuesday as running back LeSean McCoy left practice with a strained left hamstring.

He is set to undergo an MRI to determine just how bad the injury is.

McCoy is a critical piece to the Bills offense in 2015 after they acquired him from the Philadelphia Eagles. He made his preseason debut last week against the Carolina Panthers, rushing for 16 yards on six carries.

The Bills running back depth is now a concern. The Bills are already without Fred Jackson, Bryce Brown, Boobie Dixon, and Karlos Williams.

On the receiving end for the Bills, Percy Harvin could also miss another week of practice. His hip injury hasn't gotten much better and the Bills have given him a platelet-rich plasma injection.

Harvin didn't play in the game against the Panthers. Rex Ryan does hope to have him before the preseason ends in order to get work before the season opener.