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Ex-UFC heavyweight champ Frank Mir tells TMZ Sports he will probably NOT fight the 2 year ban he just got from the USADA for a banned substance ... and will likely look to fight in another country instead.

The United States Anti-Doping Agency says Mir failed a drug test following his UFC Fight Night 85 bout with Mark Hunt and hit him with a retroactive 2 year ban that will end in about 11 months.

But 37-year-old Mir tells TMZ Sports he doesn't wanna wait around -- "I'll keep looking for ways to fight."