Adrian Peterson ain't done with football yet ... the future Hall of Famer says he still wants to play -- and he revealed to TMZ Sports he's got his eye on joining one of the three big Super Bowl contenders this year.
The former Minnesota Vikings star -- who's training his ass off to fight Le'Veon Bell in a celeb boxing match this weekend -- said despite his newfound goals in the ring ... he's hoping someone gives him a call to play football later this season.
Specifically, the running back said he's targeting the Bills, Rams and 49ers.