Manziel was diagnosed with a concussion on Wednesday afternoon after reporting symptoms to the medical staff that morning.
USA Today reported that he paid cash for a meal at the Heart Bar at Planet Hollywood, and interviewed Tina Samira, a waitress who served Manziel and his guests.
A casino employee also examined Manziel's photo ID at a blackjack table and said "we've got Johnny Manziel with us tonight," John Hornacek, 43, a patron who was there at the time, told USA Today.
Browns Vice President of Communications Peter John-Baptiste would not confirm for USA TODAY Sports if Manziel was in Cleveland. He told cleveland.com the report was untrue when USA Today MLB digital editor Scott Boeck first tweeted it.
Because Manziel has been diagnosed with a concussion, he does not have to attend the game. But the club certainly wouldn't endorse him going to Vegas with a concussion.
