When an 18-year-old creates Real Madrid a historic moment in a key European match against City, it inevitably draws acclaim and the spotlight.
In only his first start in the tournament - and fifth appearance for the club - Thiago Pitarch made a strong impression as the 15-time Champions League winners claimed a 3-0 last-16 first leg lead at the Santiago Bernabeu.
The teenager, who also had his Real debut in the qualifying round a month ago with a cameo off the bench at Benfica, then assisted the Madrid side overcome the English champions in the midweek second leg to secure a last eight place.
Aged 18 years old, the midfielder became the team's youngest player to start twice in the Champions League's latter rounds, beating Brazil forward Vini Jr's previous mark by 10 days.
The midfielder is the most recent to emerge from the club's academy and is quickly establishing himself as one of the manager's most promising protegees.
He signed for Madrid from CD Leganes in the summer of 2023, having formerly spent time at Atletico Madrid and Getafe's youth teams, and starting out for the under-19 side, where he rapidly created a positive impact.
Pitarch progressed to the reserve side and it was in a friendly match in which they faced the senior squad, then coached by Arbeloa, where the youngster is said to have caught the attention of the present manager, who replaced the previous coach in the new year.
Spanish media would later label the moment as "love at first sight," noting Pitarch excelled not only for his technical ability, but for the vitality, character and determination he brought to the team.
During the pre-season of 2025, former boss Alonso called up Pitarch to train with the senior squad and gave him playing time during the warm-up matches.
Yet, it was the change in manager that proved the turning point in his career as he was introduced as a second-half replacement in both ties against Benfica that set up the meeting with Pep Guardiola's team.
"I've dreamed of this each night when sleeping, the very first time I began playing the game, each day you head to training and every day you play a match," said Pitarch after his first appearance.
"I have just fulfilled my dream with the best team in the world and in the top tournament."
Handed a starting debut in La Liga against Getafe - where he was for several seasons after arriving from Atleti in 2018 - he has kept his spot for the next four as injuries to Bellingham and Ceballos provided an opportunity.
Pitarch has taken it with displays that have defied his youth and experience.
"He's a very quick player, and you can see his capabilities," said the coach. "He is incredibly dynamic, with great endurance, work-rate and mobility."
The player's mindset has also stood out to his coach.
"His greatest quality is his personality," continued Arbeloa. "He constantly demands the possession, and even under pressure, he remains unfazed.
"I understand people are surprised to watch him start in a Champions League match, but he's playing because I had complete confidence in him to perform what he usually does.
"Thiago will keep receiving opportunities with the first team. It is delightful to have a talent like him."
Pitarch was born in Fuenlabrada, in the Madrid region, and was raised fully immersed in the local game, moving through youth setups before joining Real Madrid's famous youth academy.
He possesses dual Spanish and Moroccan citizenship, offering him the option to represent both nations at senior international level.
Under international regulations, footballers may appear for different countries at youth level without being permanently tied, with the ultimate choice only binding once they play in a official full international.
Pitarch has played for Spain at underage levels, representing both the under-19 and U20 teams, and took part in the 2025 Youth World Cup, where Spain reached the quarter-finals.
Nevertheless, he has yet to commit to any senior national team, who are monitoring his progress with keen attention.
In a recent interview, Pitarch confirmed: "I haven't made my ultimate choice so far. Things are positive with the Spanish federation, but I'll make a decision soon."
His situation mirrors that of other dual nationality talents such as Real team-mate Brahim Diaz and Barca star Yamal. Whereas teenage Yamal opted for La Roja, Brahim decided to represent Morocco.
At present, Pitarch's focus is on making his mark in the Real side and rewarding his manager's belief.
He featured for 74 minutes in the two-one win at the Etihad, which sealed a 5-1 aggregate success and a quarter-final tie with the German champions.
His substitution by another academy player in Angel to emphasise the coach's confidence in the next generation to aid the team chase trophies to come.
After his notable contributions so far on the Champions League, Pitarch is expected to be a central figure in that.
"Arbeloa handles me the same. We handle it very normally. I attempt not to think about it too much - I must earn my minutes on the field," he said following the win at Etihad Stadium.
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