Bobby Parnell’s stint as the Mets’ closer may not be temporary.

Manager Terry Collins tabbed Parnell to take over the spot if Frank Francisco isn’t ready to start the season in his prolonged comeback from elbow soreness, but pitching coach Dan Warthen said yesterday it will be Parnell’s job to lose.

“Absolutely,” Warthen said. “If Bobby’s doing well, he’s going to keep doing it.”

Parnell gave up his first run of the spring yesterday in a 9-6 victory over the Astros at Tradition Field. After retiring the first two batters he faced in the ninth, he fumbled a play covering first to extend the inning and surrendered an unearned run.