When an teenage makes club a historic moment in a key Champions League match against City, it inevitably draws acclaim and the spotlight.
During his first start in the tournament - and fifth game for the club - the young midfielder suitably impressed as the 15-time European champions claimed a 3-0 round of 16 first leg lead at the 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 helped Los Blancos defeat the English champions in Tuesday's second leg to confirm a last eight berth.
Aged 18 years and 226 days, the midfielder became the club's youngest player to begin two matches in the Champions League's latter rounds, surpassing Brazil forward Vinicius Jr's previous mark by a week and a half.
The midfielder is the latest to emerge from the famed youth system and is rapidly cementing himself as one of Alvaro Arbeloa's most exciting young players.
He signed for Real 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 Juvenil C team, where he quickly made a positive impact.
He worked his way up to the B team and it was in a pre-season game in which they played against the academy's first team, then managed by Arbeloa, where the teenager is said to have drawn the eye of the present manager, who replaced the previous coach in January.
Reports would later describe the moment as "an instant connection," noting Pitarch stood out not only for his technical ability, but for the energy, character and determination he added to the team.
During the summer of 2025, former boss Alonso called up Pitarch to train with the first team and gave him minutes in pre-season.
Yet, it was the change in manager that became the defining moment 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've dreamed of this every night before going to bed, the very first time I began playing football, each day you head to training and every day you have a game," said Pitarch following his debut.
"I have just achieved my dream with the greatest club in the planet and in the best competition."
Given a starting debut in La Liga against Getafe - where he was for several seasons after arriving from Atleti in 2018 - he has kept his place for the following four as injuries to Bellingham and Dani Ceballos created an opportunity.
Pitarch has seized it with performances that have belied his age and inexperience.
"He is a very quick player, and you can observe what he's capable of," remarked Arbeloa. "He's incredibly energetic, with excellent stamina, work-rate and mobility."
Pitarch's mentality has also impressed his manager.
"His standout trait is his personality," continued he. "He always wants the possession, and when pressed, he doesn't feel it.
"I realize fans might be surprised to watch him make his debut in a European fixture, but he is selected because I had complete trust in him to perform what he usually does.
"Thiago will keep receiving opportunities with the first team. It is delightful to coach a player like him."
Pitarch was born in Fuenlabrada, in the Madrid region, and was raised fully immersed in Spanish football, progressing through youth setups before joining Real Madrid's famous youth academy.
He holds both Moroccan and Spanish nationality, giving him the option to play for both nations at the highest level.
According to Fifa eligibility rules, footballers may represent different countries at youth level without being locked in, with the final decision only binding once they play in a official full international.
He has featured for Spain at youth level, representing both the under-19 and U20 sides, and participated in the 2025 Fifa Under-20 World Cup, where Spain made it to the last eight.
Despite this, he has not yet decided to any full national side, who are watching his rise with keen attention.
In a recent interview, Pitarch said: "I have not taken my ultimate choice yet. Things are positive with Spain, but I'll make a decision soon."
This scenario echoes that of other bi-national players such as club colleague Diaz and Barcelona forward Yamal. While teenage Lamine chose Spain, Brahim decided to represent Morocco.
For now, Pitarch's focus is on making his mark in the Madrid lineup and repaying Arbeloa's faith.
He featured for over an hour in the two-one victory at City, which completed a 5-1 overall triumph and a quarter-final matchup with Bayern Munich.
His substitution by another academy player in Angel to emphasise the coach's confidence in the next generation to aid the team pursue future success.
Following his impressive impact to date on European football's biggest stage, Pitarch is tipped to play a key role in that.
"The manager handles me the identical way. We handle it very naturally. I try not to overanalyze it too much - I have to earn my minutes on the pitch," he said following the success at Manchester.