However, aware that Leicester City's Ben Chilwell could cost four times more than the 23-year-old, Chelsea quickly emerged as another potential destination.
According to ESPN, the Blues have already held discussions with Real regarding a deal, with a season-long loan or a permanent deal worth £22.5m both on the table.
Reguilon has made a positive impact during his 23 appearances for Real, only losing his place in the squad due to the big-money addition of Ferland Mendy last summer.
Chelsea are expected to be able to offset any fee with the sale of Emerson Palmieri to one of a number of Italian clubs interested in his services. body check tags ::