The footballer everyone is talking about in Spain and Brazil right now is Atletico Madrid star Diego Costa. The 25-year-old striker - who has been arguably the best player in La Liga this season, topping the Pichichistandings with 10 goals in eight games - caused a storm last week when he pledged his allegiance to the World Cup holders.
Despite representing Brazil earlier this year in friendlies against Italy and Russia, Costa is eligible to switch nations as he has lived in Spain for more than five years and has not played a competitive game for the land of his birth.
But are the rules, which Selecao coach Luiz Felipe Scolari has branded "backward", fair? Goal's Carlo Garganese and Paul Macdonald go head-to-head over this contentious issue.
"FIFA MUST GET TOUGH AND USE COSTA AS AN EXAMPLE" |

By Carlo Garganese
If Diego Costa plays for Spain, then we will have the official confirmation that international football is a farce. The Atletico Madrid striker appeared twice for Brazil as recently as March, in friendlies against Italy and Russia. The fact that he can be allowed to switch countries just over six months later makes a mockery of the sport.
Everywhere you look there are naturalised players who should not be eligible for their new nations. Over the last year, Qatar have called up 15 players who were not born in the Gulf state. The number of Brazilians appearing recently for adopted countries is embarrassing: Thiago Motta for Italy; Pepe for Portugal; Roger Guerreiro for Poland – the list goes on and on. As Fifa president Sepp Blatter warned in 2007: "If we don't stop this farce, if we don't take care about the invaders from Brazil then, in the 2014 or 2018 World Cup, out of the 32 teams you will have 16 full of Brazilian players.