“I am very proud and honoured to wear the Everton shirt. I will give my best to this team,” said Kean.
“I was convinced to sign because Everton is a club looking to the future and so am I. I know about the size of the club. It has big ambition and I will work very hard to help us fulfil what we want to achieve.
“I am used to winning and I want to bring this winning attitude to the team.”
On signing Kean, Everton manager Marco Silva said: “A striker was one of our priority signings this summer.
“Moise is strong, fast, with many good qualities as a striker and he is just 19 years old. He has talent and he is ready to work, ready to improve our squad and gives us different solutions.”
Last season, Moise Kean scored six Serie A goals in 13 appearances for Juventus.