When an 18-year-old makes club history in a pivotal Champions League match against City, it naturally attracts acclaim and the spotlight.
In only his maiden start in the tournament - and fifth game for the club - Thiago Pitarch suitably impressed as the fifteen-time Champions League winners claimed a three-nil last-16 first-leg advantage at the Bernabeu.
The teenager, who also made his club debut in the qualifying round a few weeks prior with a substitute appearance at Sporting Lisbon, then assisted Los Blancos overcome the English champions in the midweek return to confirm a quarter-final berth.
At 18 years and 226 days, Pitarch was the club's most youthful starter to start twice in the Champions League knockout stages, beating star Vini Jr's previous mark by 10 days.
This talent is the most recent to come through from the famed youth system and is quickly establishing himself as one of the manager's most exciting protegees.
He joined Madrid from Leganes in 2023, having previously been with Atletico Madrid and Getafe's academies, and initially featuring for the Juvenil C team, where he rapidly created a strong impression.
Pitarch progressed to the reserve side and it was in a friendly match in which they played against the senior squad, then coached by the former defender, where the youngster is said to have caught the attention of the current Real boss, who took over from Xabi Alonso in January.
Spanish media would later label the moment as "love at first sight," adding he excelled not only for his skill on the ball, but for the vitality, character and drive he brought to the team.
In the pre-season of 2025, former boss Xabi Alonso called up Pitarch to practice with the first team and awarded him minutes during pre-season.
Yet, it was the change in manager that proved the defining moment in his career as he came on as a late substitute in both ties against the Portuguese side that led to the clash with Manchester City.
"I have dreamed of this every night before going to bed, the first day I started playing the game, each day you head to training and every day you play a match," said Pitarch following his first appearance.
"I've just achieved my dream with the greatest club in the world and in the top tournament."
Given a first start in the Spanish league against Getafe - where he spent four years after arriving from Atleti in 2018 - he has kept his spot for the next four as fitness issues to Jude Bellingham and Dani Ceballos provided an opportunity.
Pitarch has seized it with displays that have belied his youth and inexperience.
"He is a very quick footballer, and you can observe his capabilities," said the coach. "He is incredibly energetic, with great endurance, effort and mobility."
The player's mindset has also impressed his coach.
"His greatest quality is his character," added he. "He always wants the ball, and when pressed, he doesn't feel it.
"I understand people are astonished to see him start in a European fixture, but he is selected because I had total trust in him to perform what he usually does.
"He will continue to get opportunities with the first team. It is delightful to coach a talent like him."
Pitarch was born in a Madrid suburb, in the Spanish capital's community, and was raised fully immersed in Spanish football, moving through local academies before entering the club's renowned youth academy.
He possesses both Moroccan and Spanish citizenship, giving him the choice to play for either country at the highest level.
According to international regulations, footballers may represent multiple nations at junior level without being permanently tied, with the final decision only final once they appear in a official senior international match.
Pitarch has played for Spain at underage levels, turning out for both the U19 and U20 sides, and took part in the 2025 Fifa Under-20 World Cup, where Spain made it to the quarter-finals.
Despite this, he has not yet decided to either full national side, who are watching his rise with interest.
Speaking recently, Pitarch confirmed: "I haven't made my ultimate choice so far. My situation is great with Spain, but I'll make a decision soon."
His situation echoes that of other bi-national talents such as Real team-mate Diaz and Barcelona forward Yamal. While 18-year-old Lamine chose La Roja, Diaz decided to play for the Atlas Lions.
For now, his attention is on establishing himself in the Madrid lineup and rewarding Arbeloa's faith.
He played 74 minutes in the two-one victory at City, which completed a five-one overall triumph and a quarter-final tie with Bayern Munich.
He was replaced by fellow youth graduate in Manuel Angel underscored the coach's confidence in younger players to aid the team pursue trophies to come.
After his impressive impact so far on European football's biggest stage, Pitarch is tipped to play a key role in that.
"The manager treats me the identical way. We handle it very naturally. I try not to overanalyze it excessively - I have to earn my minutes on the pitch," he commented following the success at Manchester.
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