It appears to be one-and-done for Julio Teheran.

The Mets designated the veteran right-hander for assignment on Tuesday, a day after he allowed four runs on six hits and two walks in 2 ⅔ innings during the Mets’ win over the Braves Monday night in Atlanta.

In a corresponding move, the Mets called up right-hander Dedniel Núñez from Triple-A Syracuse.

Teheran, 33, signed a major league contract with the Mets last week after the team lost starting pitcher Tylor Megill to the injured list with a shoulder strain.

That was the second blow to the Mets rotation after ace Kodai Senga went down early in spring training with his own shoulder strain.

Teheran, a two-time All-Star with the Braves, was a free agent after spending spring training with the Orioles.

He appeared in 14 games (11 starts) for the Brewers last year, pitching to a 4.40 ERA in 71 ⅔ innings.

The Mets can recall Jose Butto as early as Friday, and it’s possible he’ll take Teheran’s turn in the rotation on Saturday against the Royals.

Butto, 26, started the second game of a doubleheader last Thursday against the Tigers and allowed one run on three hits and three walks in six innings with six strikeouts.