The Mets have placed right-hander Rafael Montero on the disabled list with throwing shoulder tightness Terry Collins has deemed "nothing serious," per the Wall Street Journal.
GM Sandy Alderson chimed in, calling it inflammation in his rotator cuff and confirming that it's not a serious injury.
Montero had been optioned to the minors following his Tuesday start, but that move will probably be rescinded, allowing him to go on the major league DL.
He had pitched five games this season, including four in relief. He fanned 13 in 10 innings, but owns a 4.50 ERA.