Reguilón has enjoyed a phenomenal season with Sevilla, establishing himself as one of the best left-backs in La Liga.
It's believed that the 23-year-old would be available for around €25 million. However, according to reports, Chelsea are looking the purchase Reguilón on loan.
With all this talk of the Blues looking to bring the full-back to Stamford Bridge, who is Sergio Reguilón?
Where it all began
Born in Madrid, Reguilón grew up playing for Real's youth set up. After several impressive performances with Real Madrid Castilla, Julen Lopetegui gave Reguilón a chance to play for the first team.
He made his professional debut in October 2018, against CSKA Moscow. Unfortunately for the Spaniard, Lopetegui was sacked soon after the defeat to Moscow. Replaced by Santiago Solari, Reguilón made his La Liga debut at home to Real Valladolid in November.
In what was a poor campaign for 'Los Blancos,' Zinedine Zidane took over in March. From then on in, Reguilón struggled to consistently make Zidane's starting eleven.
Reguilón made over 20 first-team appearances in what was a solid campaign from the youngster.
Reguilón's 2019/20 season with Sevilla
The full-back was loaned Sevilla for the 2019/20 season. Coincidentally, Julen Lopetegui was appointed as the new manager of Sevilla. Lopetegui was eager to bring in Reguilón.
Eventually finishing 4th in the league, Sevilla impressed the masses this season with Reguilón one of their stand out players.
A tactical insight into Sergio Reguilón
Averaging a just over two tackles per games, as well as just under two interceptions a game, Reguilón has also shown signs of his attacking ability. The Spaniard has scored twice and has chipped in with four assists.
Playing an important role for Sevilla this season, Reguilón tends to operate in a lot of the sides build-up play. Operating deep and out wide, just ahead of the defensive line, the Spaniard is always hungry to receive the ball and look for options up the field.
When attacking, Reguilón tends to overlap and tries to find positions whereby he can pick out a cross, or sometimes even find a shooting opportunity. With Sevilla using their wide players for a lot of their play, Reguilón plays a role in which will allow him to make late runs to provide options for the attackers.
One of his best attributes is the way he operates with the ball going forward. His lightning pace allows him to easily beat his man and carry the ball forward.
In terms of his defensive ability, the Spaniard loves to win the ball high up the pitch. Sergio tends to win a lot of his defensive duels when Sevilla are on the backfoot.
After an impressive season, it's no surprise that Europe's top clubs are after Sergio, especially with the reasonable price tag next to his name. Therefore, Reguilón would be a good asset to Frank Lampard and his Chelsea side.