Sources: QB Josh McCown out, Cody Kessler in vs. Miami

— -- Cleveland Browns rookie quarterback Cody Kessler will start Sunday against Miami while Josh McCown deals with a shoulder injury, league sources told ESPN's Adam Schefter.

After this past Sunday's? 25-20 home-opening loss to the Baltimore Ravens, McCown said his left shoulder and arm were "all right" and that he planned to play in Miami.

However, a source told Schefter that McCown's shoulder injury could be something more serious than soreness or a bruise and the quarterback would undergo and an MRI on Monday on his shoulder.

The Cleveland Plain Dealer first reported that McCown would have an MRI.

McCown started Sunday in place of Robert Griffin III, out for a minimum of eight games?after he was injured in Week 1. Late in the first quarter Sunday, McCown left for the locker room to have his left shoulder examined. At that point, his return was described as questionable.

McCown returned for the Browns' first possession of the second quarter and did not miss another play -- although at times it appeared he might.

McCown grimaced in pain several times after being hit. At one point, it seemed he might not be able to return, but he did.

The scene was reminiscent of last season, when McCown tried to play through broken ribs. McCown eventually missed two games, returned and was lost for the season with a broken left collarbone.

As of Sunday evening, McCown and rookie Kessler?were the only two quarterbacks on the roster. Rookie Kevin Hogan is on the practice squad. Going into a game with Kessler and Hogan seems risky, but not a lot riskier than going in with Kessler and a player signed off the street during the week.

The options on the street are not great. Michael Vick is available, and Aaron Murray is on the Eagles' practice squad. Names such as Matt Flynn, T.J. Yates, Charlie Whitehurst, Tarvaris Jackson and Jimmy Clausen also might circulate. And the Browns could try the longshot move of talking Jason Campbell out of retirement; Campbell played for coach Hue Jackson in Oakland.

But with Jimmy Garoppolo injured and Tom Brady suspended, the Patriots also are looking for a quarterback, so the Browns would have competition for the top free agents.

Information from ESPN's?Pat McManamon was used in this report.