When an 18-year-old creates club history in a crucial European match against City, it naturally attracts acclaim and attention.
In only his maiden start in the competition - and fifth game for the club - Thiago Pitarch suitably impressed as the fifteen-time European champions claimed a 3-0 last-16 first leg advantage at the Bernabeu.
The young player, who also made his Real debut in the qualifying round a month ago with a substitute appearance at Benfica, then assisted the Madrid side overcome the English Premier League side in the midweek second leg to secure a last eight berth.
Aged 18 years and 226 days, Pitarch was the team's most youthful starter to begin two matches in the Champions League knockout stages, beating Brazil forward Vini Jr's record by 10 days.
This talent is the most recent to emerge from the famed youth system and is rapidly cementing himself as one of the manager's most exciting protegees.
He signed for Madrid from CD Leganes in the summer of 2023, having previously been with Atletico and Getafe youth teams, and initially featuring for the Juvenil C team, where he rapidly created a positive impact.
He worked his way up to the reserve side and it was in a pre-season game in which they played against the senior squad, then coached by the former defender, where the youngster is said to have drawn the eye of the present manager, who took over from the previous coach in January.
Spanish media would later label the moment as "love at first sight," noting Pitarch stood out not only for his skill on the ball, but for the energy, character and drive he added to the team.
In the pre-season of 2025, former boss Alonso invited the youngster to practice with the senior squad and gave him minutes during pre-season.
Yet, it was the change in manager that proved the turning point in his career as he came on as a late substitute in each leg against Benfica that led to the clash with Pep Guardiola's team.
"I have dreamed of this each night before going to bed, the very first time I began playing football, each day you go to train and each day you play a match," stated Pitarch after his debut.
"I've just achieved my dream with the greatest club in the world and in the top tournament."
Given a starting debut in the Spanish league against Getafe - where he was for four years after arriving from Atleti in 2018 - he has kept his place for the next four as injuries to Bellingham and Dani Ceballos provided an opening.
The teenager has taken it with displays that have defied his youth and experience.
"He is a very quick footballer, and you can see what he's capable of," remarked Arbeloa. "He's incredibly energetic, with excellent stamina, effort and mobility."
Pitarch's mentality has also impressed his coach.
"His standout trait is his character," continued Arbeloa. "He constantly demands the possession, and even under pressure, he remains unfazed.
"I understand people are astonished to watch him start in a European fixture, but he is selected because I had total confidence in him to do what he usually does.
"He will continue to get chances with the main squad. It's a pleasure to coach a talent like him."
Pitarch was born in Fuenlabrada, in the Spanish capital's community, and grew up deeply involved in the local game, progressing through local academies before entering the club's renowned youth academy.
He possesses dual Moroccan and Spanish nationality, giving him the choice to represent either country at senior international level.
Under international regulations, players may represent multiple nations at youth level without being permanently tied, with the ultimate choice only binding once they play in a official senior international match.
He has featured for Spain at youth level, representing both the under-19 and under-20 teams, and took part in the 2025 Youth World Cup, where La Roja made it to the quarter-finals.
Despite this, he has not yet decided to either full national side, who are monitoring his progress with interest.
In a recent interview, Pitarch confirmed: "I have not taken my final decision so far. Things are great with the Spanish federation, but I will reach a decision soon."
This scenario echoes that of other dual nationality players such as club colleague Brahim Diaz and Barca star Lamine Yamal. While teenage Yamal chose Spain, Brahim opted to represent the Atlas Lions.
For now, Pitarch's focus is on establishing himself in the Real side and rewarding Arbeloa's faith.
He featured for over an hour in the two-one victory at City, which sealed a 5-1 aggregate success and a quarter-final matchup with Bayern Munich.
His substitution by fellow youth graduate in Manuel Angel underscored the coach's confidence in younger players to aid the club chase trophies to come.
After his impressive impact to date on European football's biggest stage, Pitarch is expected to play a key role in that.
"Arbeloa handles me the identical way. We handle it very normally. I try not to overanalyze it excessively - I must earn my minutes on the field," he commented following the win at Manchester.
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