The Mets don’t have an everyday answer to replace second baseman Robinson Cano, who’s out indefinitely with a torn left hamstring, which is why Joe Panik being designated for assignment by the Giants could be a factor for them.

Panik, the Long Island native and former St. John’s star, hitting .235 with just three homers, but the second baseman might be worth consideration.

Sources said the Mets hadn’t yet made a decision on whether to take a serious look at the 28-year-old, who was cut loose by the Giants after they traded for the Reds’ Scooter Gennett.

Panik is making $3.8 million and players on waivers no longer are eligible to be traded this month. He either can be claimed, with the team that gets him picking up his salary or clear waivers and be released — and eligible to be signed as a free agent.

Asdrubal Cabrera had been a consideration before the former Met, released last week by the Rangers, signed with the Nationals. Ruben Tejada, meanwhile, has hit well at Triple-A Syracuse.

For now, Mickey Callaway said he will go with a rotation at second, with Jeff McNeil, Luis Guillorme and Adeiny Hechavarria all in the mix. McNeil also will be part of an outfield rotation with Juan Lagares and Aaron Altherr.

In Tuesday’s 5-0 win over the Marlins, the Mets went with McNeil in right field and Guillorme at second — though McNeil was lifted from the second game of Monday’s doubleheader with a right calf cramp.

“I think one of those guys, every day, is gonna cover Cano,’’ Callaway said. “Maybe one or two guys stands out and shows us they deserve more playing time. That’s the best solution I can think of at this point. I hope a couple guys get it done and we won’t lose a step.”

Considering the lack of production the Mets have gotten out of Cano, maybe Callaway will get his wish but all the players he mentioned have been woeful at the plate — and Guillorme, Hechavarria and Lagares combined to go 1-for-11 in Tuesday’s victory.

Callaway also does not want to overwork McNeil, which means he would rather not play him too frequently in the outfield.

The manager, nevertheless, didn’t hesitate to put McNeil in right on Tuesday despite Monday’s cramp issues.

“He felt fine and we feel like there’s no risk for him go out there and play [right field],’’ Callaway said of McNeil, who had his fourth straight multi-hit game.

Callaway also opted to keep two of the Mets’ hottest hitters, Michael Conforto and Amed Rosario, out of the lineup.

“It came to a point where their workload was so high, you have to give them an off day,’’ Callaway said.

The manager pointed to Monday’s doubleheader and the fact that he doesn’t plan on sitting anyone much down the stretch.

“It’s gonna be full-bore,’’ Callaway said. “There’s not gonna be much rest after this, so this is kind of their last chance. Then we’ll be getting after it.”

Curtis Granderson received a nice ovation from the Citi Field crowd when he came up for the first time in the top of the sixth. Granderson entered as the left fielder in the bottom of the third after shortstop Miguel Rojas left with a hamstring injury and Jon Berti moved from left to short.

Granderson played for the Mets from 2014-17 before being traded midseason to the Dodgers.

Callaway pointed to one possible reason why the Mets have played better at Citi Field than they have in years past.

“One thing we thought we could stress is to spray the ball around a little bit,’’ Callaway said of their offensive approach at the spacious park. “Just not sit out there and try to hit homers. But we’ve hit more homers. A lot of times, that’s the way to hit better: Not try to do something, just play the game and you end up doing better in those spots.’’

Steven Matz will look to bounce back on Wednesday after a bad performance in his last outing — which followed two good performances.