Chelsea winger Christian Atsu is now a Newcastle player having spent the season on loan with the Magpies.
The 25-year-old winger who has never played for the Blues, has completed a move to join former interim manager Rafa Benitez after helping them win the Championship.
“We are happy to sign a good player,” said Benitez.
“He’s shown us that he’s a good professional and someone who is very keen to learn and improve.
“Christian has been a key part of our promotion campaign and he wants to help us to build something for the future.”
Atsu, 25, has spent the 2016/17 campaign on loan with Newcastle, helping them secure a return to the Premier League at the first attempt. Atsu appeared 32 times, scoring five goals for the Championship winners.