WEST PALM BEACH, Fla. — As the Mets keep their fingers crossed concerning Jose Quintana, they have a separate finger concern to worry about.

Kodai Senga was scratched from his Saturday start against the Nationals at the Ballpark of the Palm Beaches due to “discomfort at the base of his right index finger,” the club said.

Senga, a righty, was set to undergo imaging.

The Japanese star made his spring and stateside debut Sunday, when he was wild early but recovered and allowed one run in two innings.

Senga twice threw his vaunted ghost forkball, once for a strikeout, and cited the pitch clock as a bother.

He felt he was rushing, so further experience with the timer before the season begins would be helpful.

It is unclear how long Senga will be sidelined.

Throwing once a week (but typically throwing more pitches) last year, he pitched in 23 games in the Japan Pacific League, with a 1.89 ERA in 148 innings.

The development with Senga — who was signed to a five-year, $75 million contract this offseason — was the second injury the Mets announced Saturday.

Lefty reliever Brooks Raley sustained a low-grade hamstring strain while playing with Team USA.

As of Saturday afternoon, the Mets still had not formally announced how severe Quintana’s injury is.

The veteran starter has been out indefinitely since he sustained a “small stress fracture” in his fifth rib on his left side, the Mets said.

They sent him to New York for further tests Monday.

“We’re not there yet,” manager Buck Showalter said of Quintana on Friday night. “We’re still gathering all the information and getting some different stuff back. We’ll get through it. … We’re still trying to make some evaluations.”

David Peterson has been seen as the front-runner for a rotation spot if Quintana is not ready for the first weeks of the season.

If Senga is pushed back, too, Tylor Megill would be the most likely fill-in.