Bills quarterback A.J. McCarron exited Friday's preseason contest with the Browns in the first quarter, suffering a hairline fracture of the collarbone per Vic Carucci of the Buffalo News.
“A.J. McCarron has a right shoulder injury but we won’t know more until we get back to Buffalo,” Bills coach Sean McDormett said following the game.
The former Bengals quarterback has spent the preseason leading Buffalo's depth chart, battling rookie Josh Allen and second-year passer Nathan Peterman for the top spot.
McCarron has thrown six career touchdowns, all coming in 2015. Prior to being drafted by the Bengals in 2014, McCarron was a three-year starter at Alabama, tossing 77 touchdowns.
Prior to leaving the game, McCarron went 3-6 for 12 yards.