Porto are in talks with Atletico Madrid for Oliver Torres.
Marca says the deal still needs to be rubber-stamped buy the player but this is thought to be a formality.
After spending the 2014/15 season on loan at the Portuguese giants, Torres will at least be returning to familiar surroundings.
Although the fee hasn't yet been made public, it's thought to be higher than the 18 million euros that Swansea recently paid to the Rojiblancos for the capture of Borja Baston.
Torres played 39 games under Julen Lopetegui, then Porto coach, and he was a revelation in the Portuguese championship.