French champions Paris Saint-Germain on Tuesday said the club had activated an option worth an estimated €40 million to sign Portugal international Nuno Mendes on a permanent deal.
The agreement ties the 19-year-old Mendes under contract with PSG until 2026.
Mendes spent the past season on loan at PSG from Sporting Lisbon. He made 37 appearances and established himself as the first-choice left-back at the Parc des Princes.
The teenager was one of four PSG players named in the Ligue 1 team of the year – alongside Gianliugi Donnarumma, Marquinhos and Kylian Mbappe.