The 28-year-old Dutch international joined Barcelona from Ajax in 2019 and is in his seventh season with the Catalan giants, winning two La Liga titles and the Copa del Rey twice.
De Jong has struggled for form at times but became a key part of the midfield under Hansi Flick last season alongside Pedri, and the Dutchman now often captains the side.
Arriving under previous Barca president Josep Maria Bartomeu, De Jong is one of the club's highest earners, with Spanish media reporting he has accepted a pay cut in his new deal starting from the 2026/27 season.