SAN DIEGO — As the Mets’ starting rotation moves toward full health, team officials are considering various options. 

Among the ideas under consideration: a four-man rotation that would include Justin Verlander, Max Scherzer, Kodai Senga and either Jose Quintana or Carlos Carrasco.

The squeezed-out pitcher, if such a plan is implemented, would move to the bullpen in a long-relief role and then return to the rotation when a fifth starter is needed.

The Mets won’t need that fifth starter until July 22 at Boston. 

As of Friday, team officials still considered a five-man rotation as the most likely scenario to begin the second half, but planned to discuss the matter through the weekend.

If the Mets choose to employ a four-man rotation it would give Verlander an additional start in July, and would include one fewer outing for the fifth starter.

Team officials have also discussed the possibility of a six-man rotation — which would include David Peterson or Tylor Megill — but that idea is said to be the least likely of all scenarios. 

Just the fact that Mets officials are considering the shorter rotation signifies their comfort level in beginning to pitch Senga on four days’ rest.

The Mets have been judicious in giving Senga extra days between starts in the first half, but the plan from the outset was to ease in the Japanese right-hander before placing him on a normal schedule in the second half. 

If the Mets opt for the four-man rotation, they would have to choose between Quintana and Carrasco.

The lefty Quintana would be returning from the injured list — his final minor league rehab appearance is scheduled for Saturday with Triple-A Syracuse — so it’s possible the Mets would want him in the rotation, with Carrasco as a piggyback option until Quintana is fully built up. 

Carrasco may have made the decision more difficult, however, with his last performance: He allowed only three hits over eight shutout innings to help the Mets complete a three-game sweep of the Diamondbacks. 

Team officials will have to decide whether Carrasco’s outing was a desert mirage — he entered that start with a 5.94 ERA this season — or if he has found something with a new grip on his slider.

Quintana is scheduled to pitch a simulated game at Citi Field on Thursday, a day before the Mets open the second half.

That suggests the earliest he would be able to make his Mets debut is July 18, the beginning of a series against the White Sox at Citi Field.

The start of that series follows a day off, so Verlander, Senga and Scherzer could return to follow Quintana (or Carrasco) after pitching against the Dodgers in the first series following the All-Star break. 

Peterson and Scherzer are scheduled to start for the Mets on Saturday and Sunday to complete the first half.

Team officials were encouraged by Peterson’s last start — his first since returning from Syracuse — in which he allowed one earned run over four innings against the Giants. 

After a dreadful stretch that perhaps played the largest role in the Mets’ 7-19 nosedive in June, the rotation has been fortified over the last couple of weeks.

That included successive gems by Senga and Carrasco to help the Mets complete their three-game sweep of the Diamondbacks. 

“It’s just good to see, the starting pitchers especially, are providing consistency and getting deep into games,” Scherzer said. “That is our job … when we do our jobs it makes everybody on the pitching staff better.” 

Senga’s performance Wednesday, in which he struck out 12 and allowed one earned run over eight innings, resonated the loudest for the Mets during the five-game winning streak they took into Friday. 

“Senga was special,” Scherzer said.

“The way he was really able to slice and dice that lineup, that was an impressive start.”