Mets send Cooper Criswell to Mariners for cash considerations as busy week continues

The Mets are not done making moves just yet.

Although a smaller deal compared to the Mets’ flurry of acquisitions over the past week, the Mets sent pitcher Cooper Criswell to the Mariners in exchange for cash considerations, Seattle announced Friday.

Criswell had been designated for assignment on Wednesday.

The 29-year-old righty, who was used as a swingman by the Red Sox last season, was first selected off waivers by the Mets from Boston in December in a move that was initially seen as a way to bolster the team’s pitching depth.

To make room on their roster, Seattle designated left-handed pitcher Jhonathan Diaz for assignment, who made just one appearance for the Mariners this past season.

Criswell spent his 2025 season both in Boston and as a member of Triple-A Worcester, where he pitched to a 3.70 ERA with 68 strikeouts in 65⅔ innings.

He also saw success during his brief stint in the big leagues last year, holding a 3.57 ERA through seven appearances with the Red Sox.

After being selected in the 13th round of the 2018 MLB Draft, Criswell has spent five seasons in the majors, posting a career 4.48 ERA in 154⅔ innings.

Along with spending the 2024 and ’25 seasons in Boston, Criswell has also pitched for the Rays and Angels during his career.

Criswell was then DFA’d by the Mets to clear up a spot on the team’s 40-man roster following the trade for Freddy Peralta from the Brewers.

Mets President of Baseball Operations David Stearns — who previously served as general manager of the Brewers — said that he trusts Peralta to be a consistent starter next season.

“Freddy has clearly established himself as one of the top starters in baseball, one of the most consistent starters in baseball, over the past few years,” Stearns said on a video call Thursday from Citi Field. “He’s a player I know well.

“A player I trust. A player I think will mesh very well with the organization and the team and our city.”