Alvarez elected free agency Sunday.
Alvarez was outrighted to Triple-A Syracuse on Saturday.
Alvarez was designated for assignment by the Mets on Wednesday, Tim Healey of Newsday reports.
Alvarez (0-1) took the loss Tuesday as the Mets fell 5-0 to Atlanta, giving up three runs on four hits and three walks over 2.1 innings of relief. He struck out two.
The Mets selected Alvarez's contract from Triple-A Syracuse on Tuesday, Anthony DiComo of MLB.com reports.
The Mets outrighted Alvarez to Triple-A Syracuse on Monday, Anthony DiComo of MLB.com reports.
Alvarez was designated for assignment by the Mets on Thursday, Will Sammon of The Athletic reports.
The Mets optioned Alvarez to Triple-A Syracuse on Wednesday, Tim Healey of Newsday reports.
Alvarez was recalled from Triple-A Syracuse on Friday, Anthony DiComo of MLB.com reports.