The Mets have fired pitching coach Dave Eiland, SNY's Andy Martino confirmed.
Eiland will be replaced by Phil Regan, according to Martino.
Eiland was hired before the 2018 season.
Eiland had been overseeing a pitching staff that is 20th in the majors in ERA (4.67) and had been dealing with regression from some of their key starters and relievers.
While Noah Syndergaard (4.55 ERA/3.60 FIP) and Zack Wheeler (4.94 ERA/3.84 FIP) have regressed this season, the main culprit of the Mets' pitching problems has been the bullpen, which entered Thursday with the third-worst ERA (5.46) in the majors.
Edwin Diaz has been going through a rough stretch since opening the season in strong fashion, and Jeurys Familia just landed on the IL after having a 7.81 ERA and 1.84 WHIP over his first 29 games this season. Meanwhile, aside from Diaz, the Mets have been unable to rely on any relievers besides Seth Lugo and Robert Gsellman.
Justin Wilson, who was signed to a two-year deal before the season, is on the IL with an elbow issue and was recently pulled from his rehab assignment and shut down.
Along with Familia landing on the IL, the Mets shook up their bullpen a bit recently when they DFA'd Hector Santiago, converted Chris Flexen to a full-time relief role, and promoted Stephen Nogosek from Triple-A Syracuse.