Jacob deGrom is scheduled to make his next start Thursday, Terry Collins told reporters Tuesday.
DeGrom was scratched from Monday's spring training start against the Tigers with back stiffness, but later threw 39 pitches during a bullpen session at Tradition Field.
"I think it's more precautionary," deGrom said that afternoon, when asked about skipping the start. "I really didn't want to ride on the bus for a couple of hours and then go try to pitch."
DeGrom attributed the back stiffness to a soft mattress he had been sleeping on. Matt Harvey later recommended a more firm mattress, which deGrom had overnighted to his home in St. Lucie.