The Mirror say super-agent Jorge Mendes has been given a mandate to sell striker Goncalo Ramos.
Manchester United are expected to be among the clubs that will be offered the chance to sign the highly-rated Portuguese frontman.
However, the sticking point is that Benfica are expecting to recoup a similar fee to the £85m package they landed from Liverpool last summer for Darwin Nunez.
United are looking for a striker but have already shown indications they are not prepared to spend that much on a forward after cooling interest in Harry Kane and Randal Kolo Muani.
Benfica are set to sign Girona striker Taty Castellanos, who scored four goals against Real Madrid in April, as Ramos' replacement.
