Cain has been removed from UFC's USADA drug testing pool and from the UFC heavyweight rankings.
It's anticipated that Tyson Fury versus Braun Strowman at Crown Jewel will be announced at today's Las Vegas press conference, alongside another much anticipated showdown between Brock Lesnar and Cain Velasquez. Velasquez knocked out Lesnar to win the UFC heavyweight title in 2010.
The UFC did not immediately return a request for comment.
The lineal world champion then appeared on Monday Night Raw to demand an apology from the wrestling giant, before the two traded blows inside the ring and were separated by a host of WWE stars. In November 2018, WWE proceeded to have the previous "Crown Jewel" show despite backlash from politicians and fans following the murder of Washington Post columnist Jamal Khashoggi in Saudi Arabia's consulate in Turkey.
The obvious problem is that Velasquez's prime never hung around long enough and was robbed from beginning with the crowning achievement of his career when he topped Lesnar at UFC 121 to win the heavyweight championship (while tearing the rotator cuff in his right shoulder in the process and missing the next 13 months).More news: Nobel Peace Prize to Ethiopian PM
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The 37-year-old has had his eye on wrestling for the better part of the last decade. He owns victories over the likes of Junior dos Santos (twice), Antonio Rodrigo Nogueira and Lesnar, but injuries to Velasquez's knees, back and shoulders marred his run atop the division.
Velasquez is a two-time heavyweight champion in UFC but had dabbled in wrestling lately.
"This is definitely my focus", Cain said of pro wrestling last week.
"I am undefeated in 30 professional contests and when I go to Saudi Arabia to fight Braun Strowman, I will still be undefeated".