Carlos Mane, the 20-year-old winger on Sporting, has been dubbed the 'new Cristiano Ronaldo' and is receiving interest from Chelsea, Manchester United and Manchester City.
Mane made his senior debut in October and has scored four times in 13 appearances.
Mane is under contract with Sporting until 2018 and there's a buy-out clause of €45 million.
Mane has played the last four matches as a number 10 despite beginning his career as a right winger.