Tottenham will demand £40m for Toby Alderweireld once his £25m release clause expires on Friday, report the Daily Telegraph.
The Belgium international is currently available for a cut-price fee due to the terms of his contract.
However, no club has yet triggered the clause by paying £25m, and time is running out for potential suitors to do so.
Manchester United have made Alderweireld a back-up option should they fail to land Harry Maguire.
However, Spurs chairman Daniel Levy will only sell the centre-back for £40m from Saturday onwards.
Alderweireld has just one year remaining on his Tottenham contract, but the club do not want to lose him on the cheap.
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