The Mets acquired Stanek from the Mariners on Friday in exchange for outfielder Rhylan Thomas, Will Sammon of The Athletic reports.
Stanek has struggled in his eight outings in July, allowing five runs on five hits and six walks and striking out eight over 5.2 innings while registering two blown saves and a loss. However, he's been a solid performer on the while this season while occupying a key late-inning role for Seattle, turning in a 4.38 ERA, 1.33 WHIP, 15 holds and seven saves across 39 innings. The 33-year-old right-hander will likely work in a setup or middle-relief role in front of closer Edwin Diaz.