DeGrom was scheduled to make his final start of the season Saturday against the Houston Astros.
The 26-year-old is 9-6 this season with a 2.63 ERA in 140 1/3 innings and is an NL Rookie of the Year candidate. Combined with his Triple-A time, deGrom has logged 178 2/3 innings in 2014, which is 31 innings more than his 2013 total.
Since July 8, deGrom's ERA of 1.79 trails only Dodgers ace Clayton Kershaw in the NL. DeGrom tied a modern-day MLB record on Sept. 15 when he struck out the first eight batters he faced in a start against the Marlins.
The Mets are 76-80 this season and in second place in the NL East.
- Molly Geary