He will become Everton's fourth signing of the summer transfer window, with deals having already been put in place to take Richarlison from Watford, Joao Virginia from Arsenal and Lucas Digne from Barcelona.
Barca have inserted a buy-back option for the Colombian global, who caught the eye after a series of impressive performances at the Russia World Cup.
"It is important that the club want to fight for something". "This is why I am here".
Several Premier League sides including West Ham and Chelsea had been in the hunt for the Brazilian winger while AC Milan also expressed an interest. It is the best league in the world.
'They are historically among the four most successful clubs in England and when I found out about the club and what the manager wanted from me, I was happy.
"I know about Everton's players and I look forward to being able to play with my new team".
"Everyone I have spoken to about Marco Silva has been full of praise for the new Everton manager and I think the Blues will win the division without the "Big Six" this term".
Everton spent heavily during this summer's transfer window.
"The English club will pay FC Barcelona 2.25 million euros for the season-long loan and will also pay the player's wages".
Despite disclosing the transfer fee, Barça did not reveal at what price the buy-back clause is set, but a report from Marca has claimed that it is €60m (£53.9m).