So maybe it won’t be a tough decision now, but going forward, Rangers coach Alain Vigneault is going to have to figure out what to do with Lee Stempniak.

The forward is set to take the morning skate before Tuesday’s Garden match against the Capitals, but he has just come out of a five-day quarantine for what was confirmed as another case of the mumps.

Stempniak missed the past two games because of the illness, and he is the third player on the Rangers — and 17th confirmed in the NHL — to have come down with the virus.

Even though Stempniak was able to skate on Monday by himself at the team’s practice facility in Westchester while the rest of the team was off, there is little chance Vigneault will opt to insert him right into the lineup.

The Rangers (17-10-4) recorded their sixth straight victory on Sunday night against the Hurricanes, and they’re battling the Capitals for third place in the Metropolitan Division. With Washington coming off a 2-1 home victory over the Senators Monday night, the Blueshirts are going to do all they can to take advantage of a tired team and go into the mandated three-day Christmas break on a high note.

During Stempniak’s first season on Broadway, he seems to have no greater backer than Vigneault. The 31-year-old signed a one-year, $900,000 contract over the summer, and even through some lackluster play, Vigneault dressed Stempniak for 26 of the first 29 games, which includes missing time in mid-No- vember due to a lower-body injury. More shockingly, he has averaged 1:51 of power-play time per game played, seventh among regular Rangers forwards.

It begs the question: If Stempniak does find his way back into the lineup after the break, who’s coming out?

The most likely place would be on the fourth line, where Tanner Glass — another one of Vigneault’s favorites who seems to have secured a roster spot no matter what — occupies the left wing and Jesper Fast is on the right. Fast, the 23-year-old Swede, has been unspectacular — in a good way. He has played sturdy in his own end and shown glimpses of offensive ability.

The spot Stempniak was playing, on the right wing next to Kevin Hayes and Carl Hagelin, is now occupied by Mr. Everywhere, J.T. Miller. Since being called up Nov. 29, Miller has filled in on all four lines, playing left wing, right wing and center. He wore the Broadway Hat in Carolina on Saturday, when he scored the huge game-tying goal on a power-play breakaway on which he showed good instinct in finding a seam, and then great hands in beating the very-sharp Cam Ward with a slick forehand move.

“I think I’ve mentioned this at the start of every season to my teams — as a player, being versatile is a bonus, a big bonus,” Vigneault said before that game. “Anytime you can play more than one position and find ways to contribute, you’re helping yourself and you’re helping the team.

“In J.T.’s case, he’s one of the players on our team that can play both the left and the right wing, and he can also play center. In the situation we’re in right now, I feel very confident putting him on the right side with Kevin and Carl.”

Where that leaves Stempniak, besides on the outside looking in, is anyone’s guess.

To complicate matters even more is what could be the return of 19-year-old winger Anthony Duclair, on loan to Team Canada to partake in the World Junior Championships, starting Dec. 26. That tournament ends Jan. 5, and when it’s over, Duclair can either rejoin the Rangers or go back to his junior team in the QMJHL.

If the latter happens, he’s gone until the end of the Memorial Cup, on May 31, which is deep, deep into the playoffs. If the Rangers get there — again — odds are Vigneault and his staff would already have all of this figured out, and Stempniak might be an afterthought.