Whenever a teenage creates club history in a pivotal Champions League tie against Manchester City, it inevitably draws praise and the spotlight.
During his first start in the tournament - and fifth appearance for the club - the young midfielder made a strong impression as the fifteen-time European champions secured a three-nil last-16 first-leg lead at the Santiago Bernabeu.
The teenager, who also had his Real debut in the qualifying round a few weeks prior with a cameo off the bench at Benfica, then assisted the Madrid side overcome the English champions in Tuesday's second leg to secure a last eight place.
Aged 18 years old, the midfielder became the club's youngest player to start twice in the Champions League's latter rounds, beating Brazil forward Vinicius Jr's previous mark by 10 days.
The midfielder 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 Real from Leganes in the summer of 2023, having previously been with Atletico and Getafe youth teams, and starting out for the under-19 side, where he quickly made a strong impression.
He progressed to the reserve side and it was in a friendly match in which they played against the senior squad, then coached by Arbeloa, where the youngster is said to have drawn the eye of the present manager, who took over from the previous coach in the new year.
Reports would later describe the moment as "an instant connection," noting he excelled not only for his skill on the ball, but for the vitality, character and determination he added to the side.
In the pre-season of 2025, ex-manager Xabi Alonso called up the youngster to practice with the senior squad and gave him playing time in pre-season.
Yet, it was Arbeloa's appointment that became the turning point in his development as he came on as a late substitute in each leg against the Portuguese side that set up the clash with Manchester City.
"I've dreamed of this each night before going to bed, the first day I started playing football, every day you go to train and every day you have a game," said the player after his debut.
"I have just achieved my ambition with the best team in the world and in the best competition."
Given a first start in La Liga against his former club - where he spent several seasons after moving from Atleti in 2018 - he has retained his place for the next four as injuries to Bellingham and Dani Ceballos created an opening.
Pitarch has seized it with performances that have belied his youth and experience.
"He is a extremely fast footballer, and you can observe what he's capable of," remarked Arbeloa. "He's incredibly energetic, with excellent stamina, work-rate and movement."
The player's mindset has also impressed his coach.
"His standout trait is his character," continued Arbeloa. "He constantly demands the ball, and when pressed, he remains unfazed.
"I understand fans might be surprised to watch him start in a Champions League match, but he's playing because I had total trust in him to perform his normal game.
"Thiago will keep receiving chances with the main squad. It is delightful to coach a talent like him."
Pitarch was born in Fuenlabrada, in the Spanish capital's community, and grew up fully immersed in Spanish football, progressing through youth setups before joining the club's renowned La Fabrica system.
He holds both Moroccan and Spanish nationality, offering him the option to play for both nations at senior international level.
Under international regulations, players may appear for different countries at junior level without being locked in, with the ultimate choice only final once they play in a competitive full international.
Pitarch has played for Spain at underage levels, representing both the under-19 and under-20 sides, and participated in the 2025 Youth World Cup, where La Roja reached the quarter-finals.
Nevertheless, he has yet to commit to any full national side, who are watching his progress with keen attention.
Speaking recently, Pitarch said: "I have not taken my final decision so far. Things are great with the Spanish federation, but I will reach a decision in the near future."
This scenario mirrors that of other bi-national talents such as club colleague Diaz and Barca star Lamine Yamal. Whereas 18-year-old Yamal chose La Roja, Diaz opted to represent Morocco.
For now, his attention is on making his mark in the Real side and repaying his manager's belief.
He played 74 minutes in the 2-1 win at City, which sealed a five-one aggregate success and a quarter-final tie with the German champions.
He was replaced by fellow youth graduate in Manuel Angel to emphasise Arbeloa's trust in younger players to aid the team chase future success.
After his impressive impact to date on the Champions League, Pitarch is tipped to be a central figure in that.
"Arbeloa handles me the same. We handle it very naturally. I attempt not to overanalyze it too much - I have to deserve my minutes on the pitch," he said following the win at Etihad Stadium.