The pair have 30 days to come to an agreement or purse bids will be called.

Janibek Alimkhanuly (17-0, 12 KOs) was stripped of the title after failing a drug test in the lead up to his unification clash against Erislandy Lara in December. Meldonium was the substance found in Alimkhanuly's system.

McKenna (20-0, 10 KOs), ranked No. 7 by The Ring at middleweight, picked up the finest win of his career against a former world champion when he grabbed a wide points victory over Liam Smith last April.

Oliha (22-0, 10 KOs) is The Ring’s No. 6 ranked middleweight. Now entering the eighth year of his professional career, the 27-year-old has fought mostly underwhelming opposition. In his last outing, Oliha scored a third-round stoppage win over Ivan Njegac, a fighter with 19 wins and 33 defeats.