The Cleveland Browns have refused to comment on media reports that concussed quarterback Johnny Manziel is in Las Vegas, but owner Jimmy Haslam confirmed Sunday that Manziel failed to report to a meeting with team doctors on Sunday morning.

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Manziel was placed in the concussion protocol earlier this week and was ruled out for Sunday's loss to the Pittsburgh Steelers, but concussed Browns players are to meet with doctors on Sunday mornings. 

The Browns fired head coach Mike Pettine and general manager Ray Farmer after Sunday's loss. Manziel's future with the team remains unclear, though Sports Illustrated's Peter King reports the Browns are "done" with the 2014 first-round pick.

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King notes Manziel's desire to join the Dallas Cowboys. Manziel has been linked to the Cowboys since entering the NFL out of Texas A&M University. Cowboys owner Jerry Jones has said he would have liked to pick Manziel during the 2014 Draft, but was convinced by his scouting team not to.

Manziel passed for 1,500 yards with seven touchdowns and five interceptions this season while compliling a 2-4 record. He was drafted 22nd overall in the 2014 draft by Farmer.