New York Mets' Jose Peraza reacts as he flies out...

New York Mets' Jose Peraza reacts as he flies out against the Philadelphia Phillies during the ninth inning of an MLB baseball game at Citi Field on Friday, Sept. 17, 2021. Credit: Kathleen Malone-Van Dyke

Four Mets became free agents Friday as the team created roster space at the start of what might be an awfully busy offseason.

Infielder Jose Peraza, infielder/outfielder Jose Martinez, righthander Corey Oswalt and righthander Robert Stock were outrighted to Triple-A Syracuse, the team announced. They all declined the assignment, electing free agency instead.

That quartet entered the offseason as prime roster-crunch causalities, having made minor contributions at most to the 2021 Mets.

The most prominent of this bunch was Peraza, who had a handful of big moments last season but overall didn’t hit well. He got into 64 games after signing a minor-league contract last offseason.

Martinez joined the Mets on a $1 million deal in January, but his bid to win a spot on the bench ended when he hurt his knee, requiring surgery, in March. He never made it off the injured list.

Stock pitched in two games before straining his right hamstring in July, ending his season. Oswalt appeared in three games — and pitched well — before suffering a season-ending knee injury, also in July.