Valuev got his nickname because of his size and appearance
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Nikolay Valuev will defend his World Boxing Association title against American challenger Owen Beck in April.
The so-called 'Beast from the East' became the first Russian to win a world heavyweight contest when took the belt from US fighter John Ruiz last month.
Valuev, 32, also wants to fight Vladimir Klitschko - younger brother of former WBC champion Vitali Klitschko.
"Although Nikolay has yet to sign a contract to fight Beck, everything has been agreed," said his spokesman.
Konstantin Osipov said he expected both sides to sign a formal contract within a week.
"The fight will be held on 1 April in Hamburg," he added.
The tallest and heaviest world champion in the history of boxing, Valuev is two metres 13cm (7ft) tall and weighs 147kg (323lb).