Mansoor has revealed he discovered he would be joining the WWE Raw roster the day of his debut on the red brand.
The 25-year-old, who is the first Saudi superstar to work for WWE, was shown to sign his contract on Raw on Monday's show, before engaging in a confrontation and match with United States champion Sheamus.
Mansoor's big debut on WWE's main roster comes after two years of working on 205 Live and Main Event but didn't find out about making the switch to Raw until he arrived at the ThunderDome, as usual, this past week.
Speaking to TV Insider, Mansoor said: "I found out the day of. That’s the great thing about being a WWE superstar. When you go to work, you are kept on your toes. It’s exciting.
"I’ve been coming to the ThunderDome for the last two months doing Main Event. I think people have been taking a look at me and seeing if I’m ready. I was hoping this day would come.
"A member of the production team on Monday came to me, shook my hand, and said, ‘Hey, welcome to the team.’ I can’t tell you how happy that made me."