Atletico Madrid are ready to sell Oliver Torres.
Marca says Torres will leave Atletico this summer and, with a release clause of 26 million euros, he is an affordable target for many clubs.
Porto, where the midfielder played on loan in 2014/15, is among the interested teams and it is believed that negotiations are ongoing with the Portuguese club at around 15m euros.
The Champions League runners-up are keen to reinforce their first team squad and, as such, they may be willing to sell the player at a lower price if it means that the payment can be made up front.