Reguilon heads to London for a reported fee of 30 million euros ($35 million, £27 million) plus five million more in add-ons after starring while on loan for Europa League winners Sevilla last season.
Madrid, though, will reportedly retain a buy-back option on the 23-year-old for the next two seasons for 40 million euros.
“We are delighted to announce the signing of Sergio Reguilon from Real Madrid,” Tottenham said in a statement.
“The 23-year-old left-back has signed a contract with the club until 2025 and will wear the number three shirt.”
- Manchester United were also interested in Reguilon, who played in Sevilla’s 2-1 Europa League semi-final win over Ole Gunnar Solskjaer’s men last month, but were less open to Real’s requirement for a buy-back clause.
After an impressive start to his Madrid career under former coaches Julen Lopetegui and Santiago Solari, Zinedine Zidane’s return to the Santiago Bernabeu saw Reguilon slip down the pecking order as veteran vice-captain Marcelo regained his place before the Spanish giants splashed 48 million euros on Ferland Mendy last year.
— Tottenham Hotspur (@SpursOfficial) September 19, 2020
However, Reguilon, who made his debut for Spain earlier this month, is still highly regarded in Madrid, which is why they sought a deal to be able to bring him back to the club once Marcelo, 32, departs.
Mourinho’s men are badly in need of a lift in the closing weeks of the transfer window after losing their opening game of the Premier League season
1-0 at home to Everton.