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Noah Sadiki is Sunderland's third signing of the summer.
Tom Mallows
BBC Sport journalist
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. They spoke about the history, what they want to build, and their belief in the part that I can play."
Sadiki is Sunderland's third signing of the summer as they prepare for their first season back in the Premier League since 2016-17.
Midfielder Enzo le Fee, who spent the second half of last season on loan from Roma, has signed a permanent deal, while Senegal midfielder Habib Diarra arrived in a reported club record £30m deal from Strasbourg.