Terry Collins’ stroll into Panic Citi — at least for a day — was backed by his boss Thursday.

A day after the Mets manager went full throttle with his bullpen to end a four-game losing streak with a 2-1 victory over the Marlins, general manager Sandy Alderson told The Post circumstances dictated Collins taking such a drastic approach.

Most notably, Collins used Jeurys Familia, pitching for a third straight day (as he battles sickness), to record a five-out save. Collins also summoned Jim Henderson, in his first major league season back from shoulder surgery, to pitch the seventh inning after throwing a career-high 34 pitches the previous night. Henderson’s velocity dipped to the low 90s from its previous 95- to 96-mph range.

“I think it was a big game given that we were leading late in the game and we hadn’t been in that position in four or five days,” Alderson said by phone. “So in that sense I think it was an important game, but I don’t expect this to be duplicated down the road.

“We need to get into the season, get into a routine and not a routine of getting three or four hits a night and putting the kind of pressure we have put on the starting pitching and the bullpen that we have the first week. But that will come around.”

Alderson highlighted the perfect storm of events that led to Wednesday’s bullpen decisions: several tight games on the homestand, with a short start by Steven Matz on Monday that taxed the bullpen. In addition, Jacob deGrom’s sore lat and departure for the birth of his son necessitated moving reliever Logan Verrett into the rotation.

Verrett pitched six shutout innings against the Marlins before Henderson was inserted for the seventh. Henderson loaded the bases without recording an out before Collins used Hansel Robles and Jerry Blevins to escape without allowing a run.

Addison Reed was unavailable after pitching three straight days and Antonio Bastardo had thrown 39 pitches on Monday. Collins also hoped to avoid using Robles, who pitched 2 1/3 innings on Monday. Rafael Montero had been recalled from Triple-A Las Vegas the previous night, but Collins wanted the righty as insurance if the game went extra innings.

“There were a lot of different considerations there to start the seventh and probably not a lot of great options, so I wouldn’t expect that typically somebody like Henderson would be used that way back-to-back,” Alderson said. “But that was the situation Terry faced. It was a close game and it was one that he wanted to win and we hadn’t been in a position to win a game with a lead late since deGrom pitched since the 7-2 game on Friday.”

Likewise, Alderson was on board with Familia for the five-out save.

“I do think [Wednesday] was an important game,” Alderson said. “Terry felt most comfortable going with Familia. As he stated in the press conference, he doesn’t expect that to happen [in the eighth inning] frequently.”

Thursday’s day off should help the Mets as they prepare for a three-game weekend series in Cleveland.

“No deGrom, two innings on Monday for Matz, we overtaxed the bullpen,” Alderson said. “But it will settle down.”