Khan is due to make the second defence of his title against Marcos Maidana of Argentina.
The fight has gone to purse bids and more details will be confirmed next week, with Warren confident Khan can deliver again.
"We couldn't agree terms (for the fight) and we'll see what happens next week with it," he added.
"It's a tough fight for him but he's capable. Over the last 12 months he's turned into a different fighter."
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