Vitor Belfort is heading back to the octagon after receiving a conditional licence to fight from the Nevada State Athletic Commission in Las Vegas.
The commission voted unanimously in Belfort's favour, reinstating the fighter after he failed a drug test in February.
Belfort is a former user of testosterone-replacement therapy which has since been banned.
He is not permitted to fight anywhere before December and can be subjected to random tests at any time and at his own expense.
Belfort will face middleweight champion Chris Weidman for the belt in the main event of UFC 181 at Las Vegas' Mandalay Bay Events Center on December 6th, 2014.