Ashley Cole is worried that his wife Cheryl will reveal details on their marriage troubles in a new book.

Cheryl and her Girls Aloud bandmates have signed a £500,000 deal with Transworld publishers for the book, which will tell the story of their rise from reality TV contestants to Britain's most successful girl group.

Insiders have confirmed that Ashley will "definitely" be mentioned, though Cheryl has not yet decided how much to reveal about their recent problems.

The couple's relationship hit the rocks in January after it emerged that Ashley had been unfaithful with Aimee Walton.