This article is part of Football FanCast's Loan Watch series, which takes a closer look at those players who are aiming to galvanise their careers away from the spotlight of their parent club.

Real Madrid's 2019 summer transfer window was far from perfect.

Yes, they brought in some big names like Eden Hazard and Luka Jovic but some of their decisions have been rather bizarre. One of the biggest mistakes, however, might have been their decision to loan out the 24-year-old left-back, Sergio Reguilon.

The Spaniard made a total of 22 appearances in 2018/19 for Los Blancos, registering three assists in all competitions.

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Real signed Ferland Mendy in the summer but they could well have kept Reguillon around simply for squad depth purposes.

Real reportedly forked out £47.1m to land Mendy from Lyon but that's £47.1m that could've been saved in the first place looking at Reguilon's performances for Sevilla.

So far, in the four games he has played for the Andalusian team, he has scored once and also registered an assist.

The 24-year-old left-back was solid at the back in the outing against Deportivo Alaves, registering one tackle, four interceptions and two aerial duels won.

Sevilla won the game 1-0.

But it was not just his defensive game that was great, either. Reguilon was brilliant going the other way as well, threatening the opposition in attack with two key passes, two dribbles and overall 83.3% passing accuracy.

By all standards, he was one of Sevilla's best performers, leaving him with a 7.39 rating according to Whoscored, the second-highest on the team, just behind Joan Jordan's 7.72, but the 25-year-old did net the winning goal.

It seems that Reguilon is thriving on his loan spell, so it's difficult not to wonder what might have been had he stayed at the Bernabeu rather than the club spending big on Mendy.

These performances are bound to attract Zidane's attention sooner rather than later and who knows, maybe the 24-year-old still has a future at the Spanish capital once his loan spell comes to an end.