The Script frontman hit back amid claims he and fellow coach Jessie J had hatched a plan to keep Alex Buchanan on the show during the latest battle rounds.
Danny told The Daily Mirror: "Apparently me and Jessie had a secret conversation about Alex. But my point is: if it's a secret conversation, how did anybody hear it? It's lies. All lies.
"Even if I wanted to steal an act I'm still in the bidding with three other people - you can't fix it. Chances are, that person on stage doesn't know and might go with Will. There's tactics going on from everyone but it's not a fix."
The Irish musician even claimed the rules were so strict he and the other coaches - also including Will.i.am and Tom Jones - were banned from wandering around the BBC during the blind auditions to make sure they know nothing about the contestants they are hearing.
Danny insisted: "I can't walk down a corridor during the blind auditions. If one person is seen by a coach before the blind auditions, they don't get to go on the show. There's segregation between us. It's SO not a fix. They don't allow us to see them.
"Even if I don't know they're a singer, the fact I laid eyes on them means they're off the show. It's crazy. That's what you have to do - it's the BBC."
He added: "Hand on heart, we're a credible show. The things we can't do... the BBC is so transparent, so we have to be transparent."