Ricco said it was "good news" on deGrom, who will rest before pitching again. He'll also be prescribed anti-inflammatory medication.
Rafael Montero will be called up from Triple-A to start on Tuesday against the Nationals.
Montero was just named the Pacific Coast League Pitcher of the Week for August 4-10 with Triple-A Las Vegas (MiLB.com, August 11).
Montero earned the honor with his scoreless outing on August 5. He struck out 11 batters over eight innings, allowing only one hit, against Sacramento. This is the second time Montero has been minor league pitcher of the week at any level. His other such award was in 2012 with the St. Lucie Mets.
Montero was 0-2 with a 5.40 ERA, including 17 strike outs in 20 innings, spanning four starts earlier this season for the Mets.