Matt Harvey’s fastball may be in tatters, but his hubris remains intact.

Despite enduring one of the worst starts of his career after coming off the disabled list, the embattled righthander asked to make his next appearance on short rest. The Mets granted the request, assigning Harvey to start tomorrow against the Phillies, even though it means he’ll pitch on three days’ rest rather than the standard four.

“The plan is to send him out,” manager Terry Collins said Monday. “I just got talking with him this morning. He wants to get back out there as quick as possible. He feels good.”

Harvey approached Dan Warthen with the unorthodox idea and the pitching coach was comfortable with the request because the righty threw only 70 pitches in an inauspicious return on Saturday in Houston.

Said Collins: “Even though the effort obviously was more than it is in any rehab assignment, he feels good enough that he wants to get back out.”

Facing a loaded Astros lineup and working with a fastball that never topped 94 mph, Harvey allowed seven runs and eight hits in his first game since June.

Though he did not walk a batter, he allowed plenty of hard contact and generated only a few swings-and-misses in two shabby innings, the shortest start of his career.

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Harvey’s ERA rose to 5.97, the highest it has been in his first season since undergoing surgery to treat thoracic outlet syndrome. He insisted that he has “no doubt” that he will find success and that he won’t need many starts to do so.

Extra bases

Noah Syndergaard (torn lat) will make his second rehab start on Thursday for Class A Brooklyn . . . Infielder T.J. Rivera has opted for Tommy John surgery that could sideline him for six months. A partially torn elbow ligament ended a season in which he hit .290, good enough to put himself in consideration for a spot in the infield . . . Lefthander Josh Edgin will have arthroscopic surgery on his left knee Tuesday.