Andy Ruiz tells TMZ Sports ... he'll begin his training camp for the Anthony Joshua rematch in just 2 WEEK -- which means he's clearly planning on fighting A.J. in December.
The reason this is interesting is because the two sides sides are still trying to hammer out some important details for the rematch ... most importantly, LOCATION.
Joshua wants the fight in the U.K. Ruiz says there's no way in hell he's letting that happen.
While they sort that out, Ruiz says he's going to focus on getting his body right -- which means he'll be staking it easy when it comes to his Snickers obsession.