The former Wigan boss has been announced as the successor to Manchester United-bound David Moyes, signing a four-year deal after leaving the DW Stadium
|22/1||Everton are 22/1 with Coral to finish in the top four next season
Martinez won the FA Cup with Wigan in May, beating Manchester City in the final, before seeing the Latics relegated following eight years in the Premier League.
The 39-year-old was approached by Aston Villa to replace Gerard Houllier in June 2011, before holding talks with Everton's city rivals Liverpool 12 months later but rejected a move after refusing to share control of recruiting players.
"Roberto's influence at the club, both as a player and manager, an association that spanned over a decade, will remain unforgettable to all Latics' fans," read a statement from Wigan.
"The club would like to place on record its appreciation for his tireless work during that time, culminating in FA Cup glory last month at Wembley Stadium."