Report: Mack expected to opt out, could still return to Browns

Browns center Alex Mack is expected to exercise the opt-out clause in his contract, NFL Network’s Ian Rapoport reported Monday. Opting out would make Mack a free agent, but Rapoport said that Mack eventually returning to the Browns on a new contract is “a real possibility.” A three-time Pro Bowler, Mack would likely demand big…