Buffalo Bills running back LeSean McCoy has been escorted off the field after apparently hurting his upper left leg during a joint practice with the Cleveland Browns.

McCoy pulled up short and started limping during 7-on-7 drills about an hour into Tuesday night's practice. He walked to the sideline holding the back of his left leg, and then sat on the turf, where he was attended to by numerous trainers. He required help getting up, and then slowly made his way to the locker room. He was unable to bend his left leg.

Bills coach Rex Ryan was expected to provide an update on McCoy after practice.

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McCoy led the NFL with 1,607 yards rushing in 2013 while with Philadelphia. He was acquired by the Bills in a trade for linebacker Kiko Alonso this offseason.