The 20-year-old was selected by the Mets in the 13th round of the 2014 Draft out of South Dade High School in Homestead, Fla. In his Minor League career, he's 9-10 with a 5.13 ERA in 35 games (25 starts).
Salas had become the de facto closer for the Angels in the wake of injuries to Huston Street and Cam Bedrosian. Salas posted a 3-6 record with a 4.47 ERA and six saves in 58 appearances this season. He had been with the Angels since 2014, when he was acquired along with David Freese in an offseason deal with the Cardinals that sent outfielders Peter Bourjos and Randal Grichuk to St. Louis.
The Angels will need to make a roster move before Friday's game against the Mariners. With rosters expanding on Thursday, the Angels were already planning on adding reinforcements from the Minors as early as the series opener in Seattle.