Mousasi says Ishii will not be valued properly at the company.
McGregor attained a California boxing license at the end of November.
WrestleMania 33 takes place at Camping World Stadium in Orlando, Florida on 2 April 2017.
McGregor is currently taking a break from Mixed Martial Arts.
Tate competed in the women's bantamweight division.
McGregor created history at UFC 205 by becoming the first fighter to hold two-weight titles simultaneously.
The Irishman had won the featherweight title after knocking out Brazilian Jose Aldo at UFC 194 almost a year back.
Dubliner has persistently teased the possibility of a fight with Floyd Mayweather.
Alvarez lost his lightweight title to McGregor at UFC 205 in New York.
Kavanagh says he would bet on a fight between McGregor and Mayweather taking place next year.
The Irish fighter has been granted a license to box in the state of California.
The 28-year-old is taking a break from UFC until after the birth of his first child.
Ferguson has won his last nine fights, which includes the win over Rafael dos Anjos in his last bout.
McGregor became the first person in the history of the UFC to hold two title belts at the same time.
Rousey will take on Amanda Nunes for the bantamweight title in December at Las Vegas.
Aldo has been installed as the new featherweight champion by UFC authorities.
Gall defeated Punk in the latter's debut fight at UFC 203 in September 2016.
Rousey defeated Correia at UFC 190 where the fight lasted for only 34 seconds.
McGregor is currently taking a break from the sport.
Tate announced her retirement earlier in the month after her loss to Raquel Pennington.
Mark Henry believes the Irishman needs to beat Frankie Edgar and Khabib Nurmagomedov to be called the greatest.
The 28-year-old Russian is currently unbeaten in the UFC with an 8-0 win loss record.