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Anthony Joshua given warning he is 'in trouble' against Oleksandr Usyk ahead of rematch
READ MORE: Anthony Joshua and Oleksandr Usyk rematch to air on Sky Sports in £25m dealBut any chance of Usyk getting complacent seem to have vanished with the world champion preparing with brutal sparring sessions with the likes of Kazakhstan unbeaten heavyweight Nursultan Amanzholov."He [Amanzholov] says there are days when Usyk goes to war with him. It's not easy to hurt to Nursultan but he's been on the receiving end a few times.