Emery, who will be leading Villarreal against Manchester United in the Europa League final, had coached Mata during his time at Valencia.
Emery, who will be leading Villarreal in the Europa League final against Manchester United, had coached Cavani during his stint at PSG.
Unai Emery is looking for his fourth Europa League win as a coach as his Villarreal side take on Manchester United in the final on May 26.
Villarreal held Arsenal to a goalless draw to enter the Europa League final with an aggregate score of 2-1.
Villarreal beat Arsenal 2-1 in the Europa League semi-final first leg match at the El Madrigal on Thursday night courtesy of two first half goals from Trigueros and Albiol.