Villas-Boas has recently been linked with the likes of Chelsea and Manchester City after impressing while in charge of the Europa League champions.
Da Costa told RTP: “I do not expect the exit of Villas-Boas, there is a clause price of €15million – but I am totally convinced that even if any club came in with the offer, he would reject the proposition.
“Villas-Boas is very committed to Porto and more so after this big season.
“Two days ago he also told me that if no players leave, then he will not even need any new players.”
