Vangelis is one of eight acts competing for three spots on George's team in the live shows in the knockouts this evening but it's far from plain sailing.
In rehearsals, George slams the 24-year-old's original song choice of Viva Forever by the Spice Girls.
And while some acts may not take the criticism, Vangelis would rather his mentor be truthful.
“Boy George – I am part of his team – is very honest," Vangelis admitted. "He will tell you if I doesn’t like something, which can be good.
"I’d rather people tell you what they think."
He explained: “For Sunday’s show I wanted to perform a song but he suggested something else.
"He is really encouraging as well – he said he wasn’t looking for perfection but for the emotion in the song.”
In a chat with local website Barnet Today, Vangelis went on to say he originally entered The Voice UK to push himself having been very much a 'bedroom singer' until now.
“I have always been singing but I felt I needed something that would push me, take me out of my comfort zone and the show has been very good for me," he revealed. “I did an open mic in Camden recently and it felt much more comfortable."
Ahead of his make or break performance in the knockouts, Vangelis added: “I always think success is relative – I would be comfortable whether I am singing on a record label or just working as a singer.”
The Voice UK airs tonight on BBC One from 7:45PM.