Frankie Montas is going to undergo an MRI after feeling some discomfort in his right shoulder during yesterday’s game. Montas told the New York Post’s Jon Heyman and other reporters that he is “feeling optimistic about” the injury and “I don’t think it’s anything crazy,” yet naturally any type of shoulder issue is a potential problem, especially this late in the season. Montas also missed time with shoulder soreness back in July when he was still a member of the Athletics, as he went 18 days (including the All-Star break) between starts while resting up. An injury would only continue…