Newcastle have signed Marseille winger Florian Thauvin on a five-year contract, the Tyneside have announced.
The 22-year-old Frenchman completed a medical on Wednesday and committed his future to the club until 2020.
As part of the deal to bring Thauvin to St James' Park, Remy Cabella heads the other way on a season-long loan, with the view to a permanent move next summer.
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"I am delighted to be a Newcastle United player," said Thauvin on Newcastle's official website. "I have come from France to a really big club and am very happy to be here."
"It is a big honour to know that Newcastle have been after me for such a long time and that they wanted me that much.
"They have put their trust in me and I am looking forward to playing for the team."
Thauvin was identified as a potential signing by chief scout Graham Carr more than two years ago and the club has been monitoring his situation since.
And boss Steve McClaren was happy the club have finally got their man.
He said: "Florian is a player the club have been watching for a long time and I am delighted that we have been able to sign him.
"He is a perfect signing for this club - someone who is young, with great potential and is one of the best young players in Europe.
"He is an exciting, creative talent who can score goals and make assists, and we believe he will have a very bright future at Newcastle."