The Mets are bringing back some of their former players for an Alumni Game at Citi Field on Saturday.

Those players are stretching and working out and getting their bodies ready even as we speak, because it’s all fun and games until somebody gets hurt.

No former Mets player wants what happened to Hall of Famer Mariano Rivera at the Yankees’ Old-Timers’ Day game on Aug. 9 to happen to him.

Rivera, the 55-year-old former closer who was playing centerfield in the Yankees’ first Old-Timers’ Game since 2019, tore an Achilles and underwent surgery a few days later.

The Mets’ alumni went on high alert once they heard about Rivera’s mishap.

“That was so sad,” knuckleballer R.A. Dickey told Newsday in a telephone interview. “Self-preservation at this point is what’s most important for me. I’

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