The Newcastle chairman stands to double his money on the Dutch player he paid just £5m for last summer.
With Manchester United and Liverpool also monitoring the situation, Ashley is once again set to ignore the fans and sell to the highest bidder.
Saints boss Ronald Koeman sees his fellow Dutchman, who can operate at full-back or central defence, as the perfect replacement for Nathaniel Clyne, who is expected to move to Chelsea for £15m this summer.
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