The UEFA European Under-17 Championship consists of three distinct stages: the qualifying round, the elite round and the final tournament. The format changed for 2014/15 with the expansion of the final tournament from eight to 16 teams.
The qualifying round, played in autumn, is made up of 13 groups of four countries playing in one-venue mini-tournaments. The top two from each pool progress alongside the four third-placed sides with the best record against the leading pair in their groups.
In the elite round, held in early spring, those 30 qualifiers plus the top two seeds – given a bye this far – compete in eight mini-tournament groups of four. The group winners and seven runners-up with the best record against the teams first and third in their section advance to the finals to join the hosts.
In the final tournament the contenders are split into four groups of four, with the front two from each proceeding to the knockout phase.
Further details, including the criteria for separating sides that finish level on points in a group, or after 80 minutes in a match, can be found in the official competition regulations.
1. Diogo Costa (goalkeeper, Porto)
Like Manuel Neuer but angrier. He's always shouting!
2. Diogo Dalot (defender, Porto)
Really funny. He's like a track horse, always running, but he tries to imitate Cristiano Ronaldo when he celebrates a goal.
3. Diogo Queirós (defender, captain, Porto)
I like to anticipate what the opposing midfielders are going to do before they pass the ball.
4. Luis Silva (defender, Stoke City)
On the pitch he's like an animal.
5. Rúben Vinagre (defender, Monaco)
Tireless – he doesn't stop running. I think he even runs in his hotel room!
6. Gedson Fernandes (midfielder, Benfica)
He's deceptive. He looks fragile, but he's actually one of the toughest guys.
7. João Filipe (forward, Benfica)
He can tie any defender in a knot.
8. Miguel Luis (midfielder, Sporting CP)
He has three lungs.
9. José Gomes (forward, Benfica)
Synonymous with goals.
10. Quina (midfielder, West Ham United)
Quina plays in England, but it's only now that he has discovered we're better than them.
11. Mesaque Dju (forward, Benfica)
The soul of the house. He's the funniest, most hilarious guy in the team.
13. Diogo Leite (defender, Porto)
We're telepathic. We've spent so many years together.
14. Florentino (midfielder, Benfica)
The heartbeat of the team, but he's really lazy – he looks like he's always asleep.
15. Thierry Correia (defender, Sporting CP)
One of the most gritty players in the squad. Gedson protects the ball, while Thierry is the tough guy.
16. João Lameira (midfielder, Porto)
A baby-face killer.
17. Rafael Leão (forward, Sporting CP)
He plays a lot, but he doesn't know how to walk properly!
18. Mickael Almeida (forward, Lyon)
He only has eyes for the goal.
22. Luis Maximiano (goalkeeper, Sporting CP)
Max is the second comedian in the squad, after Mesaque, but when he's on the pitch he's as serious as they come.
Coach: Hélio Sousa
His demanding nature is what has brought us here. He's so rigorous that he sometimes loses his voice.
Diogo Queirós was speaking to UEFA.com reporter Wayne Harrison.
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