Benfica president Luis Filipe Vieira has announced plans to increase Joao Felix's release clause.
The 19-year-old, who already has a release clause of €120 million, has been targeted by a host of European clubs, including Manchester United, Juventus and Real Madrid.
Vieira told Tuttosport: "I am happy that all of Europe is talking about Benfica's talents. Now it is clear that our project of betting on young players is bearing the desired results. Joao Felix the next Ronaldo? There is only one sure thing: Felix is one of the best talents produced by Portuguese football since Ronaldo.
"Juventus and Real Madrid's interest in him? Ask them. At this moment we are not interested in selling him and soon we will increase the release clause in his contract (currently €120 million).
"Joao has an incredible technique, he is fast and also very intelligent. He is a good person, he shows that he has important values that make me very proud."