Chelsea winger Christian Atsu has left the club to join Newcastle United, the Blues have announced on their official website.
The 25-year-old spent last season on loan with the Magpies and has finally made his move permanent.
Described as a "good professional and player" by manager Rafa Benitez, the Ghanaian signed a four-year contract with his new club.
"We are happy to sign a good player," Benitez told Newcastle's official website.
"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."