The club took to their official website to confirm the news, and Gueye will now join up with his new teammates ahead of the upcoming Ligue 1 campaign.
There had been doubts over whether this deal would ever go through. Back in January, Everton rejected numerous bids from PSG for Gueye, with their final offer at the time believed to have been worth around £21.5m.
Initially, Gueye was determined to force through a move away from Goodison Park, handing in a transfer request as a sign of his frustration. However, Marco Silva managed to win him over and Gueye ultimately went on to win the club’s Player’s Player of the Year Award.
PSG retained their interest in the 29-year-old, and their recent offer was seemingly enough to convince Everton to part ways with Gueye.
In total, Gueye managed 108 appearances for the Toffees after joining from Aston Villa in 2016, establishing himself as one of the finest defensive midfielders in the Premier League.