Gagnon was released by the Mets on Friday, Tim Healey of Newsday reports.
Gagnon was designated for assignment Wednesday, Anthony DiComo of MLB.com reports.
Gagnon was recalled from Triple-A Syracuse on Saturday, Tim Healey of Newsday reports.
Gagnon was optioned to Triple-A Syracuse on Friday.
Gagnon was recalled from Triple-A Syracuse on Tuesday, Tim Healey of Newsday reports.
Gagnon was optioned to Triple-A Syracuse on Tuesday.
Gagnon may be used in a save opportunity Friday with closer Edwin Diaz potentially unavailable, Anthony DiComo of MLB.com reports.
Gagnon (3-0) pitched a perfect eighth inning Wednesday to record the win as the Mets came back to beat the Nationals.
Gagnon (2-0) picked up the win in Monday's victory over the Nationals, walking one and striking out two over two scoreless innings of relief.
Updating a previous report, Gagnon won't make a spot start Monday against the Nationals, according to Mike Puma of the New York Post.