The music icon revealed the news ahead of Sunday's headline performance.
Robbie Williams has confirmed that he will be recording with Michael Bublé but not with Adele
According to recent reports, the singer was said to have secured Adele for a collaboration on his upcoming second swing album.
However, he revealed to RTÉ Ten that he is "too terrified" to ask the 'Skyfall' star to duet with him.
"She and my wife, Ayda, are really good friends and I'm really good friends with Simon [Konecki], her boyfriend", he said. "We're good pals, but I wouldn't ask Adele to sing on my record.
"The whole world wants Adele to sing on their record. I think we'll just leave it as a nice friendship, so that story about a duet is totally made up."
However, Williams did confirm that he's planning to record a duet with Michael Bublé for the album.
"I can tell you that Mr Michael Bublé is on the album," he said. "Me and Michael on the same record, I'm so excited! We're going to record a song I've written and graciously, he thinks it's a good tune too and wants to be on it... I am a big fangirl of him.
"He's quite a presence. I'm a popstar, I've got a 'character' and a 'personality' and all that but when he comes into the studio, I stand back and just enjoy him being him."
Williams starts his Take the Crown tour on June 19.
Watch Robbie Williams's music video for ‘Candy’ below: