Porto have reportedly set a price for goalkeeper Diogo Costa, who is being linked with Barcelona and Manchester City.
The Portuguese shot stopper has conceded 13 goals and kept five clean sheets in 12 appearances thus far this season.
The Premier League giants consider the Portugal international the ideal replacement for Ederson Moraes, who could be heading to Saudi Arabia next year.
Meanwhile, Barca are keen on signing a new keeper due to Marc-Andre ter Stegen's long-term injury.
Any interested club will have to cough up €43.5 million to bring in the 25-year-old, as reported by Spanish outlet Sport.
Costa's deal with Porto expires in 2027.
