After Jason Kelce beat an Olympian in an arm wrestling match over the weekend, a legend in the game now wants the former NFL star to pick on someone his own size ... and square off with him next!!
Devon Larratt -- who's dominated arm wrestling circuits for decades -- tells TMZ Sports ... he wants a piece of Kelce following the ex-Philadelphia Eagles center's now-famous run-in with rugby star Nicole Heavirland.
OLYMPIC STRENGTH
Larratt says Kelce -- at 250ish pounds -- is right in his weight class .