The 35-year-old Kongo (15-6-2) had suffered through back problems for several months, even canceling a scheduled UFC 116 bout with Roy Nelson before taking an October UFC 120 fight with Travis Browne that ended in a draw.
Afterward, the popular French heavyweight tried rehabilitation in hopes of avoiding surgery, but he underwent a procedure in early December and has been working on strengthening his back since.
The timeline of a June return could work perfectly for the UFC, which is looking for an opponent for Shane Carwin.
Ironically, Carwin is also coming off back surgery. He's already accepted a place on June's UFC 131 event in Vancouver, though his opponent is to be determined.
A Carwin-Kongo match has been rumored by some, but as of now, the UFC has not spoken to either side about a potential matchup, according to sources.