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Mahrez attempted four dribbles pastReguilon and was not successful on any of them, with Spurs moving into first place in the Premier League after the win.
In a post on Instagram, Mourinho revealed thatthe Spain international met anunspecified goal he had set, which resulted in a reward of an expensive leg of high-quality ham.
"A promise is a promise," Mourinho wrote. "It cost me £500 but I keep my promises."
Reguilon has developed into a key figure in north Londonafter he madea £28 million ($37m) move from Real Madridduring the summer transfer window.
The 23-year-old has started five of Tottenham's last six Premier League matches, delivering two assists in those games.
Mourinho's men lost their opening game 1-0 at home toEverton, but have sincepicked up 20 points from a possible 24 to take an early lead in the Premier League.
Former Spurs head coach Tim Sherwood has spoken of his admiration for the job Mourinho has done, saying he has "brainwashed" his players into becoming a force.
“He’s found a way with the group of players he has,” SherwoodtoldtalkSPORT.
“He’s bought very well, Reguilon has been a good signing at left-back, but Pierre-Emile Hojbjerg for me has been the best signing. He fits into the style and just protects the two centre-halves.
“Jose has brainwashed his players to believe they have to work to achieve something – they need to win trophies, this group of players."
Spurs will face a major early-season test on Sunday when third-place Chelsea, led by Mourinho's former charge Frank Lampard, host the league leaders at Stamford Bridge.