The organization of the middleweight bout was reported by informed sources close to the situation.
Denis Tyulyulin, 36, suffered his third consecutive early defeat last November, losing by technical knockout in the second round to Christian Duncan.
Abu Azeitar, 38, has also fallen on hard times in his career and will try to get back on a successful track after two losses, losing by technical knockout to Marc-Andre Barrio and unanimous decision to Cedric Dumas.
As a reminder, the main event of UFC on ABC 6 will be a middleweight contender fight between Robert Whittaker and Khamzat Chimaev, and the co-main event will feature Russian heavyweights Sergey Pavlovich and Alexander Volkov in the octagon.