The former Liverpool and England midfielder was sacked by the club, following Villa's 3-0 defeat to Fulham in the Premier League.
After stepping down as manager of La Liga side Villarreal, Emery will take over at Villa from November 1st, pending formalities.
In a statement published via Villarreal's official media platforms, the club confirmed the unilateral termination of Emery's contract.
"Emery has gone down in Villarreal CF history for becoming the first coach to win a title with the club, the UEFA Europa League, as well as the historic achievement of reaching the Champions League semi-finals last year and helping the team qualify team for European competitions for two consecutive seasons," it said.
"Villarreal CF would like to thank Unai Emery for the work he has done and wishes him the best of luck in his career."
