Real's football chiefs are seeking a new, long-term right-back signing this summer and Wan-Bissaka tops their shortlist of options.
Okdiario says Real management accept they'll have to cough up big to convince United to sell and are willing to go as high as €70m for the defender.
Last month, Okdiario's chief pundit Eduardo Inda revealed: "Real Madrid are looking for a right back. They have the best who is Dani Carvajal, although the problem is injuries.
"Madrid have (Alvaro) Odriozola, (Eder) Militao can play there too. Odriozola is considered to have not had the expected progression.
"Two options are being considered. Achraf, who does not have a buyback price, but a trial and error price. Achraf enchants in Madrid.
"Another who enchants is an English right-back, a great full-back named Aaron Wan-Bissaka."