CeeLo Green was offered Pharrell Williams' hit track Happy, it has emerged, but his team turned the song down.

Pharrell penned and produced the feel-good track and enjoyed worldwide success with it when he put his vocals to it this year.

But the singer, who is set to become a coach on The Voice USA, told US radio host Howard Stern that it was originally intended for Cee Lo Green.

"[Cee Lo Green] wanted to do it... and he did do it," said Pharrell, who spent years as a producer before singing his own music.

"But... how do I say this diplomatically? The powers that be, at the time, did not see it fit for him."

He added: "He wanted to do it. Some folks on his team just felt that the priority should be on [his] album at the time, so they elected not to do that song."

Pharrell added: "He was one of the most gracious people about it when [Happy] came out he congratulated me. It's not his fault - he was totally down with it. He sounded amazing on it, he burns my version!"