Hatton's last fight for Warren was on 6 April 2005 when he notched a career-defining win over IBF light-welterweight king Kostya Tszyu.
BBC: SPORT | Boxing | Warren drops Hatton legal action
2.
Australia's Kostya Tszyu remains the man to beat, but WBO champion Miguel Cotto, another Puerto Rican, is being touted as his heir apparent.
BBC: SPORT | Boxing | Boxing 2005 - Rest of the world
3.
He believes it's the biggest British heavyweight title fight in recent memory and without doubt a fine addition to the Ricky Hatton-Kostya Tszyu and Scott Harrison-Michael Brodie bills in June.
BBC: SPORT | Boxing | Williams playing dangerous game