Brandon Nimmo treated Sunday’s All-Star Game disappointment predictably — by looking at the bright side. He admittedly was hoping to be included, but was also pleased to even be part of the discussion.

“That’s encouraging because of where I started this year. I was supposed to be a bench player,” Nimmo said before the Mets split a doubleheader with the Phillies, winning 4-3 in 10 innings before losing 3-1, at Citi Field on Monday. “So to even be in these All-Star conversations, I should be really proud of that and really happy about that.”

Nimmo has been one of the Mets’ lone bright spots in this dismal season, the team leader in OPS (.884) and on-base percentage (.382). But he has tailed off of late, with just six hits in his past 43 at-bats that coincided with him missing a few games after getting hit in the right pinkie finger.

“I felt like if I finished a little bit stronger these last couple of weeks maybe things would’ve been a little bit different,” Nimmo said.

Todd Frazier’s forgettable first season in Queens hit yet another speed bump Monday. The Mets’ third baseman was placed on the disabled list with a left rib cage muscle strain, his second time on the shelf in two months after not being put on the DL during the first seven years of his major league career.

“It’s something I never thought would happen,” said Frazier, who previously missed 24 games with a strained left hamstring.

Frazier, who owns a .217/.300/.385 slash line with a pedestrian .685 OPS, felt the injury in his first at-bat in Sunday’s loss to the Rays and it progressively worsened. He had an MRI exam and received a cortisone shot to ease the pain.

Ty Kelly, who went 0-for-3 during the doubleheader, was called up from Triple-A Las Vegas to replace Frazier on the roster. Jose Reyes started both games at third base. He went hitless in five at-bats, but Mickey Callaway said Reyes is likely to see a lot of time there moving forward.

“I think the experience, [being a] switch hitter, I think he’s been playing pretty good baseball when we put him in there,” Callaway said of Reyes, who is one for his last 15 and batting .168 on the season with an anemic .474 OPS. “So I think he deserves to have a shot a third.”

Callaway said prospect Jeff McNeil wasn’t called up because the Mets envision him as “purely” a second baseman. McNeil, who has a .346/.417/.634 slash line with a 1.051 OPS this year for Double-A Binghamton and Triple-A Las Vegas, has appeared in 148 games at third base in his minor league career, but only nine games this year.

Right-handed reliever Jacob Rhame was called up from Las Vegas as the team’s 26th man for the doubleheader. He popped up Maikel Franco to start the eighth inning of Game 2 before exiting. Sunday’s starter Chris Flexen was optioned and replaced by left-hander P.J. Conlon to give the bullpen another arm. After Game 1, the Mets reinstated left-handed reliever Jerry Blevins from the bereavement list and designated right-hander Chris Beck for assignment. Blevins pitched a scoreless 1 ²/₃ in Game 2.

The Mets have yet to decide on Noah Syndergaard’s next step. The right-hander, out since May 25 with a strained right index finger, made a rehabilitation start with Single-A Brooklyn on Sunday and was impressive after a shaky start, striking out seven and allowing one earned run over five innings in a 2-1 win over Staten Island. He threw 71 pitches, 46 for strikes.

“He looked really good,” Callaway said. “We haven’t made a decision on exactly when he’s going to pitch, but we’re optimistic it will be with us next.”

Jason Vargas threw six shutout innings, struck out nine and allowed one hit for Single-A Brooklyn in a 2-1 loss to Staten Island on Monday night in his rehabilitation start. The left-hander threw a simulated game last week as he works his way back from a strained right calf. He last pitched for the Mets on June 19.

It didn’t take long for first-round pick Jarred Kelenic to get promoted. The outfielder from Wisconsin will debut for Single-A Kingsport on Tuesday after tearing up the Gulf Coast League, bating .413 (19-for-46) over 12 games with a 1.060 OPS and .451 on-base percentage.