Sunderland have signed DR Congo midfielder Noah Sadiki from Belgian side Royale Union Saint-Gilloise.
The 20-year-old has signed a five-year contract and joins for a reported fee of £15m.
Sadiki made 108 appearances for Union since joining from Anderlecht in 2023 and helped the club win the Belgian title last season.
The Brussels-born midfielder, who can also play in defence, represented Belgium at youth level but switched allegiance to DR Congo and made his senior international debut in 2024.
"I want to thank everyone for welcoming me to Sunderland," said Sadiki.
"This is a huge club, but what convinced me was speaking to the people.