Atletico Madrid relied on the young Portuguese to replace Frenchman Antoine Griezmann and so far his pre-season performances and at the start of the domestic competition have been more than positive (1 goal, 1 assist and a slalom for the memory in the first day that caused a penalty).
About to turn 20, the Viseu-born faces his second season as a professional. In his first experience in the first team of Benfica, under the orders of Rui Vitória, he scored 19 goals and gave 11 assists.
Cholo Simeone and his team set have a rough diamond in their ranks, the compliments about their young star do not stop coming.
"I am 19-years-old, but I have the maturity necessary to face this", he said as soon as he reached the squad.
Vinicius Junior - Real Madrid - 19-years-old - Brazilian (12 June 2000)
Vinicius signed for Real Madrid on the 23rd of May 2017, a day and a half after winning his last League. The Brazilian, a personal bet of Juni Calafat (captain of Madrid in Brazil), could not land in Valdebebas until he turned 18 in the following season.
The striker took his first steps as a Real Madrid player in Real Madrid Castill, coached by Santiago Solari and quickly asked for his promotion to the first team, who were not getting good results at that moment in time.
With the appointment of Solari as coach after the dismissal of Julen Lopetegui, the young star broke into force, despite being only 18 years old, at the Santiago Bernabéu and was responsible for bringing joy(minimum) to fans who saw their team fall eliminated in all three competitions in a single week.
This season, now with Zinedine Zidane as coach, the player (debuted on Tuesday with defeat against Peru) will play his second season in the Champions League with the aim of starting.
Ansu Fati - FC Barcelona - 16-years-old - Guinean (31 October 2002)
The youngest player on this list. His family and him arrived in Herrera (Sevilla) when he was just 6-years-old in the search for a better life.
He quickly caught the attention of scouts from big teams in Spain and it was Barcelona that recruited him to play in the youth squad, La Masia.
With injuries to their star players, Leo Messi and Luis Suarez at the start of this season, Valverede gave him the opportunity to train at Camp Nou (He made the unusual ascent from the first team youth squad by Víctor Valdés to the first team senior squad) in the 5-2 victory against Real Betis.
On the following day, in front of the newly promoted Osasuna, Ansu Fatti entered El Sadar to score the goal of the tie after a header into the back of the net.
At 16-years-old and 304 days he became the youngest player to score a goal for Barcelona in La Liga, breaking the record that Bojan Krkic had previously had before (17-years-old and 53 days).
On Saturday, against Valencia, he only needed less than 2 minutes to to become the youngest scorer in the history of the Barca club in their stadium. And in the 7th minute, an assist from him allowed Frenkie de Jong to set the score line to 2-0.
The young striker, who is in the process of nationalizing as Spanish, was included in list B for the Champions League and can perfectly be recruited by Valverde if he sees fit.
Mason Mount - Chelsea - 20-years-old - English (10 January 1999)
Born in Portsmouth, Mason Mount is one of the big hopes for the English team. This past season he was loaned to Derby County where he set great performances and maintained a fixed position in Frank Lampard's starting XI.
The former Chelsea midfielder (Frank Lampard), who is the top historical scorer of the team with 211 goals, returned to the London club as a coach (replacing Italian coach Maurizio Sarri) and requested that they bring back Mount to continue improving him, now as the first team player to all effects.
"It's a very proud moment for me and my family. I started at this team when I was 6-years-old and it has always been my aim to play for the first team", Mount said after renewing his contract until 2024.
Mount debuted with Gareth Southgate's English national team on the 8th September against Bulgaria in their 4-0 victory and he now has the opportunity to do the same in the Champions League.
Jadon Sancho - Borussia Dortmund - 19-years-old - English (25 March 2000)
Sancho is probably the most promising English youngster at this moment in time. Formed in the lower categories of Manchester City, he decided to 'emigrate' to Borussia Dortmund, a club known for betting on young talents, to continue his growth.
In Germany, Sancho established himself as an elite player in the last two seasons, demonstrating a maturity on the field that was unusual for his young age.
His constant evolution as a footballer has led him to play for the England national team, where he scored his first two goals against Kosovo.
Together with Paco Alcácer and Captain Marco Reus, he forms one of the most dangerous tridents of European football. At Signal Iduna Park they have high hopes for them to get the pass to the final round after being framed with Barcelona, Inter Milan and Slavia Prague.
Rhian Brewster - Liverpool FC - 19-years-old - English (1 April 2000)
He grew up in the Chelsea acadamy, where he gradually climbed up the ranks and became an emerging scorer. Upon arriving at the Chelsea youth team, he decided to change London for Liverpool, where German coach Jürgen Klopp welcomed him with open arms.
The Stuttgart-born coach summoned him for the semifinal against Barcelona where his team trailed 4-0 at Anfield and for the final at the Wanda Metropolitano in Madrid, where the he received a champions medal, despite not playing a minute of the game.
"With the talent and attitude he has, he'll be fine. In many preseason moments he looked great. The future is bright," Klopp said at the start of this season.
Phil Foden - Manchester City - 19-years-old - English (28 May, 2000)
The midfielder is the great hope of Manchester City. A pearl that Spanish coach Pep Guardiola relishes. At 17, he became the youngest English player to start in the Premier League.
Undisputed headline in the lower categories of England, Foden was champion (alongside Rhian Brewster) in the Under-17 World Cup with England and with Steve Cooper.
He debuted two seasons ago in the group stage of the Champions League in the 1-0 victory against Dutch Feyenoord (he became the youngest English player to debut in the top continental competition) and scored his first goal in round 16 at the end of last season against Schalke 04.
At the beginning of this campaign, Foden has only played 10 minutes in the Premier League, very low figures for a player who received great offers from Steven Gerrard's Rangers and Paulo Fonseca's Roma in the summer market.
After dazzling in the last match of the U21 national team against Turkey, the young promise of English football said that "it would have been good if Pep had seen the Turkish game, but perhaps he had taken a small vacation to play golf or something like that! I wouldn't blame him. ''
"I only know that I am ready to play. I try to show it every day in training," he concluded.
Kai Havertz - Bayer Leverkusen - 20-years-old - German (11 June 1999)
The young Bayer Leverkusen star has a lot of big European teams fighting for him. He debuted in Bundesliga at the age of 17.
Despite being only 20-years-old, Havertz became one of the great sensations of German football and the youngest player in the history of Bundesliga to reach 50 games.
The coach of Germany, Joachim Low, summoned him for the first time for a friendly against Peru in the city of Sinsheim; He went from the U19 directly to the Senior national team.
"He's the greatest talent I've seen since Toni Kroos," said Heiko Herrlich, former coach of Bayer Leverkusen.
Ianis Hagi - KRC Genk - 20-years-old- Romanian - (22 October 1998)
He has football in his blood. Son of Gheorghe Hagi, former Barcelona and Real Madrid player. Isanis is a talented midfielder with a big eye for goal.
He took his first steps in the Viitorul Constanta, a club owned by his father, who has been responsible for helping to boost Romanian football.
After a fleeting stint at Fiorentina (he played at Santiago Bernabéu in the summer of 2017) he returned to Viitorul Constanta where he recovered his best version, scoring a total of 20 goals in 53 games.
After dazzling in the Romanian league there were several teams that were interested in having his services, including the renewed Sevilla de Monchi and Lopetegui.
Finally he ended up signing for the Belgian Genk, with which he will look for the difficult pass to round 16 in a group where they face the current European champions, Liverpool, Napoli and Red Bull Salzburg.
He stood out in the European Under-21 of Italy, where Romania managed to reach the semifinals, and Cosmin Contra decided to summon him (along with 7 other teammates of the Under-21) for the Romania national team, where he faced Spain.
Ferran Torres - Valencia - 19-years-old - Spanish (29 February 2000)
One of the talents of the future in Spanish football. Raised in Valencia, he debuted in the first team in the 2017-2018 season thanks to the confidence of Marcelino García Toral.
In the last campaign, he enjoyed several opportunities in the first division, where he got 2 goals and one assist.
He was also one of the pillars of the U19 national team of Santi Denia that was awarded European champion in Armenia last July.
After dazzling in the Armenian tournament he made the jump to the U21 team, with which he debuted last Friday in the 0-1 victory against Kazakhstan in Nur-Sultan.
This season, being a first team player, he will try to help his team reach the knockout stages of the Champions League, in a group where Chelsea English, Dutch Ajax and French Lille will be.