The agent of Porto coach Vitor Pereira says a move to Everton could be on.
Everton manager David Moyes is off contract in June and yet to discuss new terms.
Christophe Henrotay, in an interview with O Jogo, said: "Rumours about Everton? It is true there is interest from several clubs.
"But now is not the time to discuss this. He does not speak with any club and this will remain until the end of the season."