Whenever a 18-year-old creates Real Madrid a historic moment in a pivotal Champions League match against Manchester City, it inevitably draws acclaim and attention.
During his maiden start in the tournament - and fifth appearance for the team - the young midfielder made a strong impression as the fifteen-time Champions League winners claimed a 3-0 round of 16 first leg advantage at the Bernabeu.
The young player, who also made his club debut in the qualifying round a month ago with a substitute appearance at Benfica, then helped Los Blancos defeat the English Premier League side in Tuesday's second leg to confirm a last eight berth.
Aged 18 years and 226 days, the midfielder was the club's youngest player to begin two matches in the Champions League's latter rounds, surpassing Brazil forward Vini Jr's previous mark by a week and a half.
The midfielder is the latest to emerge from the club's academy and is rapidly cementing himself as one of the manager's most promising young players.
He signed for Real from CD Leganes in the summer of 2023, having formerly spent time at Atletico and Getafe's academies, and starting out for the Juvenil C team, where he quickly made a strong impression.
Pitarch worked his way up to the B team and it was in a pre-season game in which they faced the senior squad, then coached by Arbeloa, where the youngster is said to have caught the attention of the current Real boss, who took over from Xabi Alonso in the new year.
Reports would later label the moment as "love at first sight," noting Pitarch stood out not only for his technical ability, but for the energy, personality and determination he brought to the team.
During the summer of 2025, ex-manager Xabi Alonso invited the youngster to practice with the senior squad and awarded him playing time during the warm-up matches.
However, it was Arbeloa's appointment that proved the turning point in his career as he was introduced as a late substitute in each leg against Benfica that set up the meeting with Pep Guardiola's team.
"I have dreamed of this each night when sleeping, the very first time I began playing football, each day you go to train and every day you play a match," said the player after his first appearance.
"I have just fulfilled my ambition with the best team in the world and in the top tournament."
Handed a starting debut in La Liga against his former club - where he spent several seasons after moving from Atleti in 2018 - he has kept his spot for the following four as fitness issues to Bellingham and Ceballos provided an opening.
The teenager has taken it with displays that have belied his age and inexperience.
"He's a very quick player, and you can observe what he's capable of," remarked the coach. "He's incredibly dynamic, with great endurance, effort and movement."
Pitarch's mentality has also impressed his manager.
"His greatest quality is his character," continued Arbeloa. "He always wants the possession, and even under pressure, he remains unfazed.
"I realize people are astonished to see him make his debut 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 Spanish capital's community, and was raised deeply involved in the local game, progressing through local academies before entering Real Madrid's renowned youth academy.
He holds dual Moroccan and Spanish nationality, giving him the choice to represent either country at the highest level.
Under Fifa eligibility rules, players may appear for multiple nations at youth level without being permanently tied, with the ultimate choice only final once they appear in a competitive senior international match.
He has featured for the Spanish national team at underage levels, turning out for both the under-19 and under-20 sides, and participated in the 2025 Fifa Under-20 World Cup, where Spain made it to the last eight.
Despite this, he has yet to commit to either full national side, who are monitoring his progress with interest.
In a recent interview, Pitarch confirmed: "I haven't made my ultimate choice yet. Things are great with the Spanish federation, but I will reach a conclusion soon."
His situation echoes that of other bi-national talents such as club colleague Brahim Diaz and Barcelona forward Yamal. Whereas 18-year-old Lamine opted for Spain, Diaz opted to represent the Atlas Lions.
For now, Pitarch's focus is on making his mark in the Real side and rewarding Arbeloa's faith.
He played over an hour in the 2-1 win at the Etihad, which sealed a 5-1 overall triumph and a last-eight tie with Bayern Munich.
His substitution by fellow youth graduate in Manuel Angel to emphasise Arbeloa's trust in the next generation to help the team chase future success.
After his impressive impact so far on European football's biggest stage, Pitarch is expected 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 must deserve my playing time on the pitch," he said after the success at Manchester.
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