The 19-year-old Benfica starlet has been linked with many of Europe's elite clubs after a sensational season in the Primeira Liga.
Manchester United are one of those adding the starlet to their wish-list with Real Madrid, Liverpool and Juventus also believed to be keen.
Felix has 10 goals and five assists in 18 league appearance for the Portuguese giants, and has been dubbed the "next Cristiano Ronaldo”.
But Santos, who guided Portugal to a Euro 2016 triumph, is keen to play down any comparisons between uncapped Felix and 34-year-old Portuguese superstar Ronaldo, who has 85 international goals.