Both Tottenham and Portsmouth are said to be keen on Portuguese international Hugo Almeida.
The 22-year-old striker is not considered first choice by coach Co Adriaanse and he has given the go-ahead for his departure.
Porto are now willing to let the striker move out on loan for a season with a view to a permanent deal and that is thought to appeal to the Premiership clubs, although Bayer Leverkusen are also being linked.
Almeida is a product of Porto's youth system, but he has never been given a major run in the first team - indeed he has seen more action in his various loan spells with Boavista and Uniao Leiria.
Despite Porto's reluctance to play Almeida, Portuguese coach Luiz Felipe Scolari capped him early on during their World Cup qualifying campaign.
Almeida is understood to have been informed of the interest from abroad and is open to the possibility of moving.