As many as three NFL legends could be throwing hands on the upcoming Adrian Peterson fight card ... as Le'Veon Bell just told TMZ Sports he's got interest in boxing Frank Gore at the event.
We caught up with the former Pittsburgh Steelers tailback out at LAX this week ... and given he once knocked out Peterson in the squared circle, we had to ask about the upcoming tilt between A.P. and his poker rival, Joe "Baby Joe" Castaneda.