Kingsley Coman, 19 (France and Bayern Munich)
He has already won the German Bundesliga, Italian Serie A and French Ligue 1 titles. If France live up to their favourites tag at Euro 2016, he would have a trophy cabinet that some veterans can only dream about.
Such was Pep Guardiola's faith in the pacey winger last season that the Bayern Munich manager started Coman in 20 league games.
Coman scored four goals and provided six assists in Bayern's title-winning campaign. He saved his best form for the Champions League. No player had more assists in Europe's elite club competition than Coman (five).
Despite just five appearances for Les Bleus, he has already opened his scoring account and will be looking to add to that tally on home soil.
Marcus Rashford, 18 (England and Manchester United)
The striker is the tournament's youngest player. His form with Manchester United - eight goals in 18 games in all competitions - made it impossible for England manager Roy Hodgson not to select him.
Rashford had the best shot conversion rate (55.6 per cent) in the Premier League last season. Last month, he scored within 135 seconds of his England debut, becoming the youngest player to score on his Three Lions bow at 18 years 208 days.
Renato Sanches, 18 (Portugal and Bayern Munich)
His talent and potential have been underlined by Bayern Munich's willingness to pay Benfica €35 million (S$53.83 million) for his services.
The deal, inked last month, could see the German champions splash out €80 millions in total, depending on add-ons. A powerful box-to-box midfielder,
Sanches helped Benfica win the Primeira Liga title and Portuguese League Cup last season. He was also wanted by Manchester United but opted to join the Bavarian giants.
Ante Coric, 19 (Croatia and Dinamo Zagreb)
The attacking midfielder made over 40 appearances for Dinamo Zagreb last season, when the club retained their Croatian League and Cup titles.
Four of those games came in the Champions League, where he was able to showcase his creativity, speed and vision.
Dinamo manager Zoran Mamic once said of Coric: "Ante is a treasure for our club. He is a greater talent than (Croatia and Real Madrid midfielders) Luka Modric and Mateo Kovacic were at (their) age."
Breel Embolo, 19 (Switzerland and Basel)
Of all these teenagers, Embolo, a strong, fast, and direct striker, has the best chance of being a starter for his country at the European Championship.
He is a regular at Swiss club Basel, scoring 13 goals in 40 appearances in all competitions last season. In their 2014-15 Champions League campaign, he featured in all eight games, scoring once.