Unai Emery claimed a record-breaking fourth UEFA Cup/Europa League title after Villarreal upstaged Manchester United for their first major European crown.
Villarreal conquered United in the Europa League final following a marathon 11-10 penalty shootout in Gdansk, where the match finished 1-1 after extra-time.
Gerard Moreno's first-half opener was cancelled out by United star Edinson Cavani in the 55th minute and the showdown was decided on penalties.
United goalkeeper David de Gea missed the only penalty of a lengthy shootout as Emery became the first head coach to win either the UEFA Cup or Europa League four times, surpassing Giovanni Trapattoni.
Emery won the Europa League with Sevilla in 2014, 2015 and 2016.
La Liga outfit Villarreal are the first side to win in their first appearance of a major European final since Shakhtar Donetsk in the 2008-09 UEFA Cup.