Tottenham Hotspur's decision to sign Sergio Reguilon from Real Madrid is already proving to be one of the signings of the summer. 

Daniel Levy has established himself as one of the most enigmatic and shrewd negotiators in world football during his time at the helm at Spurs, and his move for Reguilon in the summer window has provided further evidence to justify his reputation. 

On the surface, signing a player from Real Madrid may not initially strike as a work of genius.

It doesn't take a footballing expert or an eagle-eyed scout to work out that a player who has managed to get into the Los Blancos squad is likely to be blessed with incredible ability. 

But the manner in which Reguilon has managed to instantly adapt to, and excel within, his new north London surroundings has been a game changer for Spurs. 

Left-back has long been a problem position for the club amid Danny Rose's fall from grace, while Ben Davies has always been a touch short of the quality Spurs need to sustain a challenge at the elite level. 

Reguilon has changed all that in the space of just a few short weeks and at £25m he looks a snip of his true value, especially when his price-tag is juxtaposed with the £50m fees Man City and Man United paid for Kyle Walker and Aaron Wan-Bissaka respectively. 

Wan-Bissaka

Following his arrival at the club, the former Spurs player and La Liga pundit Terry Gibson gave a glowing review on Reguilon which hinted at what was to come, per Tottenham's official website.

"He’s a competitor, a winner, fiercely determined and this a player brought up at Real Madrid, so he has that background. The year at Sevilla was fantastic, he was a regular, an important player right up there with the best left-backs in La Liga."

His performances have justified the hype thus far.

With all the hallmarks of a complete modern day full-back, the Spaniard has solved one of Mourinho's overarching problems from his maiden campaign in charge. 

The 23-year-old made his fourth Premier League start of the season against West Bromwich Albion on Sunday and, though he was not at his best in the first-half, continued to prove what a top piece of business Levy has concluded. 

From an attacking perspective he was in a typically forward-thinking mood, taking three shots at Sam Johnstone's goal throughout proceedings as he looked to make an impact in the final-third, per Whoscored. He also completed one key pass - taking his per game average to 1.8 for the season - and one dribble.

Levy

Balancing the expectation to fly forward on the overlap with basic defensive responsibilities is one of the greatest challenges full-backs face in modern tactical systems, but that is not something Reguilon has struggled with in the early openings of his career in English football. 

Reguilon recorded two tackles, two interceptions and seven clearances in an accomplished defensive display, while his 82.3% pass completion rate was his best in Tottenham colours. 

But it is not only on the field where the rising star has made a profound impression.  

Alasdair Gold, football.london's Spurs correspondent, recently revealed his behind-the-scenes impact during a video on his YouTube channel. 

“Sergio Reguilon is such a character, he is so confident and everyone seems to want to hug him or fight him in a [playful] way. [Pierre-Emile] Hojbjerg had him in a headlock at one point in training, [Harry] Kane came up too, gave him a hug, and he tries to do little things, like [Erik] Lamela walked by him in training and you see him give him a little elbow, like a jokey thing as if to say ‘wahey’ and it’s just, it’s a lovely mood.”

Technically brilliant, full of promise at just 23, a likeable character and blessed with first-class experience, Reguilon looks like the real deal.