Cardiff City are demanding £5 million for Jordan Mutch.
The Evening Chronicle says Sunderland will have to activate Mutchâ€™s Â£5m release clause if they are to prise him away from Cardiff.
The Black Cats have already had a Â£3.5m bid knocked back for the attacking midfielder, and are considering coming back with an improved offer.
The 22-year-old only has 12 months left on his contract, but the Bluebirds have indicated they are not looking to sell.
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