The 35-year-old Olympic silver medallist became unified world champion in 2011 and has to his credit 34 wins from 40 fights.
Kell Brook retires from boxing after victory over Amir Khan in February brought him peace.
Khan, who won silver as a lightweight at the Athens Olympics in 2004 and is a former unified light-welterweight champion, says he is hoping to spend more time with his family.
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