Barcelona and Atletico Madrid are linked with a swap between Antoine Griezmann and Saul.
Saul is expected to leave Atleti this summer, with Liverpool frequently a rumored destination.
Barcelona are looking for a midfielder following their failure to sign Gini Wijnaldum.
Ronaldo Koeman is willing to let Griezmann leave should it ensure that Lionel Messi stays with the club.
Via Barca Blaugranes