deGrom said he's confident he'll be ready for Saturday's 4:05 p.m. ET game, but Mets manager Terry Collins said cautiously that the start was still "up in the air." Collins said left-hander Sean Gilmartin would start Saturday if deGrom can't go.
deGrom first felt the stiffness when he woke up Thursday, and he received treatment during the game against the Phillies. The training staff had him sleep in a neck brace, but when he woke up Friday, the stiffness hadn't eased enough to allow him to pitch.
"My goal is to stay healthy, and something like this happens," deGrom said. "Fortunately, I shouldn't have to miss a full turn."
deGrom has been impressive in his first three starts this season. The right-hander has a 1.89 ERA and 22 strikeouts in 19 innings, including 13 whiffs his last time out.
Harvey most recently pitched against the Marlins on Sunday. He went six innings and allowed two runs (one earned) while striking out five.
Danny Knobler is a contributor to MLB.com based in New York. This story was not subject to the approval of Major League Baseball or its clubs.