Liverpool have also been linked with a move for the Belgian striker but are reluctant to pay the player's £32.5million release clause.
And according to the Sun that has left the door open for United to swoop with a deal set to be wrapped up by the weekend.
GETTY
Sergio Ramos still wants to join Manchester United
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United's £30m offer yesterday fell well short of Real's £60m asking price.
But according to Spanish paper AS, United will slap a take-it-or-leave offer on the table for the defender, who remains determined to leave Madrid this summer.