When an teenage makes Real Madrid history in a pivotal European match against City, it naturally attracts acclaim and attention.
During his maiden start in the tournament - and fifth appearance for the team - the young midfielder suitably impressed as the fifteen-time European champions secured a three-nil last-16 first leg advantage 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 assisted the Madrid side overcome the English Premier League side in Tuesday's return to secure a last eight place.
At 18 years and 226 days, the midfielder was the team's youngest player to start twice in the Champions League knockout stages, surpassing star Vini Jr's previous mark by a week and a half.
This talent is the most recent to come through from the club's academy and is rapidly cementing himself as one of Alvaro Arbeloa's most exciting young players.
He joined Madrid from CD Leganes in 2023, having previously been with Atletico Madrid and Getafe youth teams, and initially featuring for the Juvenil C team, where he rapidly created a strong impression.
Pitarch progressed to the B team 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 drawn the eye of the present manager, who replaced Xabi Alonso in the new year.
Reports would later label the moment as "love at first sight," adding Pitarch excelled not only for his skill on the ball, but for the vitality, personality and determination he added to the side.
During the pre-season of 2025, ex-manager Alonso invited Pitarch to train with the first team and gave him playing time in pre-season.
Yet, it was the change in manager that proved the turning point in his career as he came on as a second-half replacement in each leg against the Portuguese side that led to the meeting with Manchester City.
"I have dreamed of this every night when sleeping, the first day I began playing the game, each day you head to training and every day you have a game," stated the player after his first appearance.
"I've just fulfilled my dream with the greatest club in the world and in the best competition."
Handed a first start in the Spanish league against his former club - where he spent four years after moving from Atleti in 2018 - he has kept his place for the following four as fitness issues to Bellingham and Ceballos created an opportunity.
The teenager has seized it with displays that have belied his age and experience.
"He's a very quick footballer, and you can observe his capabilities," said Arbeloa. "He is extremely energetic, with excellent endurance, effort and mobility."
Pitarch's mentality has also impressed his manager.
"His greatest quality is his character," added he. "He always wants the ball, and even under pressure, he doesn't feel it.
"I understand fans might be astonished to watch him make his debut in a European fixture, but he is selected because I had total trust in him to do what he usually does.
"Thiago will continue to get chances with the main squad. It's a pleasure to coach a player like him."
Born in a Madrid suburb, in the Madrid region, and grew up fully immersed in Spanish football, moving through local academies before entering the club's famous youth academy.
He possesses dual Moroccan and Spanish nationality, giving him the option to represent either country at senior international level.
Under international regulations, players may represent multiple nations at junior level without being permanently tied, with the ultimate choice only final once they appear in a competitive full international.
Pitarch has featured for Spain at youth level, turning out for both the under-19 and U20 sides, and took part in the 2025 Fifa Under-20 World Cup, where La Roja reached the last eight.
Despite this, he has yet to commit to either senior national team, who are watching his progress with keen attention.
Speaking recently, Pitarch confirmed: "I have not taken my ultimate choice so far. My situation is positive with Spain, but I will reach a decision in the near future."
His situation echoes that of other bi-national players such as Real team-mate Diaz and Barca star Lamine Yamal. While teenage Yamal opted for La Roja, Diaz opted to play for the Atlas Lions.
For now, Pitarch's focus is on establishing himself in the Real side and repaying Arbeloa's faith.
He featured for over an hour in the two-one win at the Etihad, which sealed a five-one aggregate success and a quarter-final tie with Bayern Munich.
His substitution by fellow youth graduate in Angel to emphasise Arbeloa's trust in the next generation to help the team chase future success.
Following his notable contributions to date on European football's biggest stage, the midfielder is expected to be a central figure in that.
"The manager handles me the same. We handle it very normally. I try not to think about it too much - I have to deserve my minutes on the field," he commented following the win at Manchester.