The Mets’ search for bullpen options includes a former All-Star who recently became a free agent.

Jeremy Jeffress, who was released by the Brewers on Sunday, is on the Mets’ radar, according to an industry source. The right-handed reliever was 3-4 with a 5.02 ERA in 48 appearances for Milwaukee this season after getting selected to the All-Star Game in 2018.

The Mets, Phillies and Reds have shown the most interest in Jeffress at this point, according to a source. Jeffress has sought a deal that would guarantee him a contract for 2020. It’s unclear if the Mets are willing to make such a commitment.

Jeffress would not be postseason eligible this year for any team that signs him, as players had to be within an organization by Sept. 1. But with Jeurys Familia and Edwin Diaz struggling, the Mets might be willing to give Jeffress a shot as somebody who could help get them to the postseason.

Already, the club added veteran reliever Brad Brach last month. In nine appearances with the Mets, the right-hander has pitched to a 5.63 ERA and respectable 1.25 WHIP.

Familia’s struggles continued Wednesday, when he allowed three runs in two-thirds of an inning in Washington, in which he allowed two hits and walked two batters. Afterward, Mets pitching coach Phil Regan blamed himself. Familia is 4-2 with a 6.43 ERA and 1.857 WHIP in 55 appearances this season.

“I’m feeling it’s my fault on Familia,” Regan said. “I think he needs to throw strikes, but I have to get him to throw strikes and I really have to take the blame for that, because his stuff is so good that we just need to get him in the right mode and he’s going to be good.”

Possibly impacting the Mets’ chances of signing Jeffress is ongoing tension between the player’s agent, Joshua Kusnick, and general manager Brodie Van Wagenen.

Kusnick has been openly critical of Van Wagenen’s transition from agent to GM because of the inherent conflict of interest. Kusnick has alleged that Van Wagenen’s former firm, CAA, tried to steal Jeffress as a client when Van Wagenen was co-head of the company’s baseball division.

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