IThe Voice coach will.i.am has tipped finalist Leah McFall to become a worldwide superstar – as the Northern Irish singer became the odds-on favourite to win the series.

Speaking ahead of Saturday’s climactic showdown the rapper described Leah as “the best artist out of every single person I’ve seen from last year to this year”.

And he added that the singer – who has already scored a top ten hit with her version of I Will Survive – had a good chance of achieving the chart success which eluded the 2012 winner Leanne Mitchell.

“She’s quirky, she’s unique,” will said. “There have been great singers but she has the greatest shot to have a career.”

Will added that he wanted the show to produce an act that would ‘get people dizzy’.

“These shows render themselves pointless if they can’t identify something that’s going to be on the radio and that’s just me being part of the show,” he said.

“In my opinion after the show is finished everyone should be scrambling, just like they were scrambling to find the next singer, just to make sure the person who won has a chance, has a shot, at the radio.

“Because that’s what the premise is, the premise isn’t just a record deal, the premise is a career.”

Elsewhere, will revealed that he had not yet decided whether he would return to the BBC One show for its third series in 2014.

“I’ve been asked to do series three,” he told the Mirror.

“But it would depend on who else was there. I feel like I’m married to Jessie so it would be weird if she wasn’t there. It’s like cheating.”

He added: “I know that when I’m having a bad day I can look to my left and she will be pulling some weird face that will cheer me up. Tom will be chilled and Danny is an inspiration – he can make a song out of anything.”

The Voice final – which will see Leah competing with Mike Ward, Matt Henry and Andrea Begley to land a recording contract with Universal – will kick off on BBC One at 7.15pm.