Before Carlos Beltran and the Mets parted ways Thursday, he seemed to have at least one Mets advisor in his corner.

Because Jessica Mendoza doesn’t mind cheating. Just snitching.

Mendoza, the Mets special assistant and ESPN announcer, criticized former Astros pitcher Mike Fiers for his role in exposing Houston‘s sign-stealing system, which led to the firings of manager A.J. Hinch, general manager Jeff Luhnow and Red Sox manager Alex Cora.

“Honestly, it made me sad for the sport that this is how it all got found out,” Mendoza said on ESPN’s “Golic and Wingo” on Thursday. “This wasn’t something that MLB naturally investigated or other teams complained about because they naturally heard about and then investigations happened.

“It came from within. It was a player that was a part of it, that benefitted from it during the regular season when he was a part of the team. When I first heard about it, it hits you like any teammate would. It’s something that you don’t do.”

Fiers, 34, took the role of whistleblower after detailing the covert plan in a November interview with The Athletic. Fiers spent three years in Houston and received a World Series ring, but didn’t appear during the postseason of the Astros’ title run in 2017. Since being traded from Detroit during the 2018 season, Fiers has been with the A’s, who play in the AL West with the Astros.

Mendoza, who would later backtrack on her comments, had no issue with Fiers talking Houston’s plot in his new clubhouse. Anywhere else was an issue.

“I mean, I get it. If you’re with the Oakland A’s and you’re on another team, heck yeah, you better be telling your teammates, ‘Look, heads up, if you hear some noises when you’re pitching, this is what’s going on,’” Mendoza said.

“But to go public? Yeah, it didn’t sit well with me.”