The New York Mets have placed ace Jacob deGrom on the injured list retroactive to July 15 with tightness in his right forearm.
DeGrom felt discomfort Friday while throwing a bullpen session at Pittsburgh, manager Luis Rojas said Saturday. An MRI hours later showed there was forearm tightness but no structural damage.
Rojas said Sunday that deGrom will not throw again until the discomfort goes away.
"I'm frustrated," deGrom said Sunday. "I don't know what else to say."
DeGrom is 7-2 with a major-league-leading 1.08 ERA in 15 starts this season despite being hampered by multiple ailments.