The 22-year old Ghanaian winger has signed a season-long loan with the Toffees after passing a medical on Wednesday afternoon and securing the required UK work permit to allow him to play in England.
"I'm very happy to be joining Everton because it's a great club, which likes to play football, and it's a great pleasure to be here," Atsu told evertontv.
"Playing in the Premier League has always been a dream for me and I have achieved that dream.
"This is the biggest level for me to play at. I know that it's a very competitive league and I believe with hard work we're going to be successful this season."
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