By
Reuters
Updated 03/09/2013 at 16:17 GMT
Sporting said in a statement on Tuesday that the value of the deal might increase to 13 million euros "depending on Galatasaray's performance". Sporting will also get 25 percent of any future transfers for Bruma.
Guinea-Bissau born Bruma, 18, was one of the top marksmen in the under-20 FIFA World Cup in Turkey this year, when he scored five goals for Portugal.
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