Mesoraco accepted a position in June as a volunteer assistant for the University of Pittsburgh baseball team, Kendall Rogers of D1Baseball.com reports.
Mesoraco has no intention to return to the Mets after Travis d'Arnaud was designated for assignment Sunday and appears to be retired, Mike Puma of the New York Post reports.
Mesoraco will be placed on the restricted list after declining a minor-league assignment, Jon Heyman of MLB Network reports.
Mesoraco is expected to retire, Matt Ehalt of The Bergen Record reports.
Mesoraco will not make the Mets' Opening Day roster, Deesha Thosar of The New York Daily News reports.
Mesoraco exercised the upward mobility out in his contract Wednesday, Matt Ehalt of The Bergen Record reports.
Mesoraco went 2-for-3 with two doubles, a run scored and an RBI in Monday's Grapefruit League game against the Astros.
Mesoraco signed a minor-league contract with the Mets on Thursday that includes an invitation to spring training.
Mesoraco hit a three-run, pinch-hit home run in his long at-bat in Thursday's win over Atlanta.
Mesorace (neck) returns to the starting lineup Friday in Washington.