The Mets selected Perez's contract from Triple-A Syracuse on Saturday.
Perez joined the Mets on a minor-league deal May 6 and has since given up two earned runs in seven innings at Syracuse while striking out 10 batters and walking five. He'll now return to the majors to replace Tobias Myers in the Mets' bullpen and likely work in low-leverage situations to begin with. Anderson Severino was designated for assignment to make room for Perez on the 40-man roster.