Bruma , 18 years old , was one of the shining stars at FIFA U20 World Cup, reaching the 16 with Portugal.
The deal with the Portuguese club that the Turkish giants have made could see the fee potentially rising to €13m depending on performances, with Sporting to receive 25 per cent of any future sale figure.
Bruma could feature in the Champions League for Galatasaray this season, where the will face Real Madrid, Juventus and Copenhagen in Group B.
