The 29-year-old moves to Goodison Park for an undisclosed fee, but Everton have paid €25m (£22.3m) plus an additional €3m (£2.7m) in incentives, according to Sky in Italy.

The move sees Allan, who has been capped nine times by Brazil, reunite with Carlo Ancelotti at Everton, having previously worked under the Italian for two seasons while he was in charge of Napoli.

The draw of Ancelotti saw Everton beat off competition from Atletico Madrid and Borussia Dortmund to capture Allan, who spent five years in Naples.

"It is a real pleasure to sign for Everton. I am immensely happy to be here," Allan told evertontv. "I hope, like I have done in my entire career, I contribute with my performances together with my teammates and that I put in some great games, great performances and win important things.