Aaron Donald might be retired from the NFL, but a discus-throwing champ is convinced the dude could still have an elite career in track and field.

TMZ Sports caught up with Reggie Jagers -- who hurled the disc for the red, white and blue during the 2020 Tokyo Games -- out at LAX this month ... and he said he's sure Donald could throw shot put at the 2028 Olympics in L.A. if he put his mind to it. Getty

Jagers told us there's not much technique involved ... and given the brute strength and cash for training that Donald possesses, it wouldn't shock him one bit to see the former Ram have success in the event.

In fact, Jagers said he'd be down to help prep Donald ... sending a message to the future Pro Football Hall of Famer right at the airport. Gallery Launch Gallery Gett

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