MILWAUKEE — Wilmer Flores’ next destination could be second base.

According to a club source, the Mets have begun discussing the possibility of installing Ruben Tejada as the shortstop and moving Flores to second once Daniel Murphy returns from the disabled list. In that setup, Murphy would play third base.

“That would be the best defensive alignment,” the source said.

The Mets have been hesitant to make such a move because they don’t want to risk breaking Flores’ confidence, but three months into the experiment, they believe he can handle the switch and move back to shortstop later in the season if needed.

If Tejada falters in an everyday role, the Mets could consider promoting Matt Reynolds from Triple-A Las Vegas to play shortstop.

The Mets have been rotating Tejada between second and third base in the absence of Murphy and David Wright.

Dilson Herrera was on the bench for Wednesday’s 4-1 loss to the Brewers at Miller Park and could return to Las Vegas once Murphy is activated, possibly by the weekend. The 21-year-old Herrera is hitless in his last 14 at-bats and is batting just .162 since his return from the disabled list on June 11.

“We know [Herrera] can handle it here, but right now he is just having a little bit of a rough time,” manager Terry Collins said. “We’ll give him a night to gather his thoughts.”

Collins’ attributed Herrera’s slump to the three weeks he spent on the DL with a fractured tip of his right middle finger.

“The quality of pitching you’re seeing, you are not going to face it anyplace else but here,” Collins said.

Murphy began a rehab assignment, going 1-for-1 with a walk for the Gulf Coast Mets as the third baseman. Collins said he would expect Murphy’s rehab assignment to last three to four games before rejoining the club.

Collins is anxious to get Jeurys Familia into a game for the first time since Friday. The right-hander hadn’t been needed because of a combination of soreness in his left groin and the Mets playing from behind late in games.

Steven Matz had a no-decision Tuesday for Triple-A Las Vegas against Salt Lake. The lefty, who is the organization’s top pitching prospect, leads the Pacific Coast League in ERA (2.19) and strikeouts (94) and is third in batting average against (.213). … Dillon Gee is scheduled to make his first start for Triple-A Las Vegas on Thursday.