Rafael Montero left his start with Triple-A Las Vegas on Saturday night after just a third of an inning, and has since been diagnosed with a left oblique strain.
Montero, 23, who was sent back to Triple-A at the end of May after making four starts for the Mets in his first taste of the majors, had struggled since returning to Las Vegas.
In his brief taste of the big leagues with the Mets, Montero posted a 5.40 ERA and 1.60 WHIP in 20 innings pitched.
It isn’t yet known whether Montero first experienced the oblique issue on Saturday night, or if he’s been dealing with it for some time.
If Montero has been dealing with the issue for a while, it would partially explain why he’s walked 4.32 batters per nine this year over 50 innings pitched for Triple-A Las Vegas.
Montero is known for his impeccable command, which has been absent in 2014.
The Mets release on Montero didn’t specify whether he would be placed on the seven-day disabled list, but that seems like a certainty.