The pair are the latest overseas stars to be linked with moves to Molineux
John, who spent last season on loan to Reading, was linked with a move to Wolves' rivals West Bromwich Albion earlier this summer, following the Baggies' appointment of former Royals man Nick Hammond as technical director (Birmingham Mail).
Dutch international John scored four goals and made another five for Reading last season
However, last week's takeover at Molineux, in which Portuguese super agent Jorge Mendes is said to be involved, has seen Kenny Jackett's side seemingly enter the race.
And John's former teammate Silvio, who has been borrowed by Benfica in each of the past three campaigns, could follow him to England, the report claims.
Silvio has eight caps for Portugal
Wolves are said to have missed out on a number of targets as they awaited the completion of their £30 million takeover, however, their recruitment drive is expected to gather pace ahead of the new season.
Monaco's Ivan Cavaleiro, who cost the Ligue 1 side £12.5 million from Benfica a year ago, and Eagles pair Pele and Helder Costa were the three players named.
Ivan Cavaleiro (right) would be a glamorous addition for Wolves