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CINCINNATI — For a third time this season the Mets are promoting a highly regarded starting pitcher with the hope of boosting an underperforming rotation.

Brandon Sproat, who began the year as the organization’s top pitching prospect, will be called up from Triple-A Syracuse to pitch Sunday against the Reds, sources confirmed on Thursday.

Sproat, who turns 25 on Sept. 17, will join a rotation that includes Nolan McLean and Jonah Tong, both of whom have debuted for the club in recent weeks.

Sproat’s promotion coincides with veterans struggling in the starting rotation, most notably Kodai Senga and Sean Manaea.

Sproat has thrived for Syracuse in the second half, pitching to a 2.59 ERA in his past 11 starts after a rough 2 ½ months to begin the season.

The Mets are looking for answers as they attempt at minimum to secure a National League wild-card berth over these final 22 games if not catch the Phillies for first place in the NL East. Beyond that, the Mets are auditioning pitchers for a potential postseason rotation.

Though Sproat is not yet on the 40-man roster, he would be eligible for postseason participation given that he was in the organization before Sept. 1.

Still to be resolved is a next step for Senga, who is expected to inform team brass by Friday if he’s willing to accept a minor league assignment as the Mets attempt to get him back on track.

Senga’s contract stipulates that he must give his consent for such a move.

As it stands, the Mets have David Peterson, Tong and Sproat aligned to face the Reds this weekend.

Team officials had originally been leaning toward McLean for the series finale, but it’s now probable he will open the four-game set that begins Monday in Philadelphia.

Manaea had been told he is pitching Monday, but it’s possible the left-hander will now move back a day.

Sproat has a familiarity with the Mets after spending much of spring training with the team.

He and McLean formed a tight bond at Syracuse.

McLean recently told The Post the key to Sproat’s turnaround this season after a rough stretch has been controlling the count better.

“He was getting behind on counts, and when you do that, it’s so much harder to get guys out,” McLean said. “He’s done just a better job of getting ahead of guys, and then he’s got such good pitches as soon as he gets ahead.”

The Mets have gotten all they could have wanted from the 24-year-old McLean over his first four MLB starts.

The right-hander’s latest solid outing was on Monday, when he held the Tigers to two earned runs over six innings.

Overall, he is 4-0 with a 1.37 ERA since his arrival last month.

His 28 strikeouts are the most in franchise history for a pitcher in his first four starts.

Tong, 22, debuted for the Mets last Friday, when he held the Marlins to one earned run over five innings with six strikeouts.

The Reds are among the teams chasing the Mets for the NL’s third wild card.

Even so, their deficit is five games, leaving the Mets in position to bury them in the race, so Tong and Sproat will be pitching in games that carry extra weight.

If McLean pitches Monday in Philadelphia, it would give the Mets a mound presence to open their four-game series against the division leader.

The Phillies began Thursday leading the Mets by 5 ½ games for first place.

The Mets claimed pitcher Wander Suero off waivers from the Braves.

The right-handed reliever has appeared in five games this season and pitched to an 11.37 ERA.