Chelsea have announced that Fluminense striker has joined the club for an undisclosed fee.
The youngster was included in manager Jose Mourinho's squad for their pre-season tour in North America.
He will wear the No.16 shirt.
"I am very happy to complete my transfer to Chelsea," Kenedy told the club's official website.
"It is an exciting time for me to join the English Premier League champions.
"I hope I can become an important player for the club.
"I very much enjoyed my time with the squad during pre-season and I am very grateful to Fluminense for allowing me this opportunity."
