Bills' McCarron getting 2nd opinion on injured shoulder

Buffalo Bills quarterback AJ McCarron is getting a second opinion on his injured shoulder after initial tests came back "not totally conclusive," head coach Sean McDermott said Sunday, according to ESPN's Mike Rodak.

McCarron left Buffalo's preseason game Thursday versus the Cleveland Browns with a reported hairline fracture in his collarbone.

The 27-year-old signed a two-year contract with the Bills in free agency and is competing with Nathan Peterman and first-round rookie Josh Allen for the starting job.

McCarron spent the first four years of his NFL career with the Cincinnati Bengals, serving as a backup for Andy Dalton.

In other Bills news, McDermott said veteran defensive tackle Kyle Williams is week to week with a knee injury, but won't require a procedure to fix whatever's ailing him.