John Newman is reportedly waiting to undergo surgery after discovering his brain tumour has returned.

The Olé singer was originally diagnosed with a benign growth back in 2012, but according to The Sun he has now been told there are 'cancerous cells' which need to be treated with.

"John's brain tumour is back. He's known about it for a while but has kept it a closely guarded secret, confiding only in those closest to him - his mum, brother and few loyal members of his family," a source has told the newspaper.

"Although the tumour is benign doctors have found a few cancerous cells on it."

The source continued: "Fortunately, because the tumour has stayed the same size for a while John's been told that surgery can wait until next year."

John himself has yet to speak about the extremely personal matter, instead focusing on the upcoming release of his and Calvin Harris' new track 'Olé' which is set to drop Friday (August 5).