The topic of dual nationality will only get bigger during the summer when Diego Costa leads the line for Spain at the World Cup, in the country of his birth in Brazil.
Manchester City's brightest youth prospect Marcos Lopes himself has two options - Brazil or Portugal.
While a regular for Portugal's under-21 side, he could still change his mind and play for the Selecao at senior level, as he himself was born in Brazil.
Yet unlike Manchester United youngster Adnan Januzaj, who has the option to play for Belgium, Albania, Kosovo - and even England potentially, and is yet to decide, Lopes says he is in no doubt.
In an interview with Portuguese newspaper A Bola, he said switching to his country of birth is not an option.
"Brazil or Portugal? It is a very difficult question. Never turn my back on my origins but the truth is that what I am as a footballer, I owe to Portugal because I graduated from there."
City signed Lopes, now 18, from Benfica in 2012. The playmaker has an impressive five goals in four UEFA Youth League games, and has played in both the League Cup and FA Cup for City's first team this season.
Lopes isn't getting ahead of himself just yet however, and knows he has much to prove until his senior call-up an international level arrives.
"I am proud to hear my name associated with two of the best teams in the world, but I do not kid myself: not done anything. I'm at a very important phase of my training and I want to concentrate only on that.
"Whatever comes in the future will be an award for my effort, dedication and professionalism. Have been to represent Portugal (at under-21), I've always been treated well so far and always live one day at a time."
At the under-21s for Portugal he has an impressive 11 goals in 16 appearances. On his time at City, he added:
"I have been fortunate to make four appearances for the first team. My dream is to win titles. The realization of this dream will depend on my work and am ready to give my best."
image: © geetarchurchy