The Mets are concerned about how poorly Frankie Montas is pitching during his minor-league rehab outings. Frankie says relax. “I feel pretty good,” Montas said on Saturday. “Nothing hurts. Nothing’s bothering me.”

The plan is for him to begin a rehab assignment next week —likely on Tuesday or Wednesday—with Triple-A Syracuse. The weather hasn’t been kind, forcing Vientos into indoor batting cages for now. But a couple more days of batting practice and baseball activity should put him in position to play games soon.

NEW YORK — The Mets haven’t gotten much production out of third base since Mark Vientos went down with a right hamstring strain on June 2 against the Los Angeles Dodgers. Fortunately, the injury was considered low-grade, and Vientos has been able to ramp up quicker than expected.

When Mets third baseman Mark Vientos strained his right hamstring June 2 in Los Angeles, he feared an extended absence. Those concerns quickly proved unwarranted. Vientos is set to begin a Minor League rehab assignment Tuesday with Triple-A Syracuse,

The important step now for Senga and the Mets is to ace this recovery process, in a way they didn’t with either of Senga’s rehabilitations last year. In both instances, it appeared he and the Mets were not on the same page at times. Questions about Senga’s next steps or his ultimate timeline were met with shrugs more often than with other players.

Mark Vientos’ return is looming. That will mean more competition for Brett Baty to remain a regular in the lineup. And an increased likelihood Ronny Mauricio is sent back down to the minors. Each homered and was a rare bright spot for the Mets in an otherwise dreary 8-4 loss to the Rays on Saturday afternoon at Citi Field.

The Mets have the best record in the National League with several key members set to return. Soon, the front office must make some tough decisions.