Villarreal missed out on a spot in the Europa League final as Liverpool triumphed 3-0 and Marcelino conceded the Reds were "superior."
Marcelino claimed Liverpool pushed the boundaries of the rules as Villarreal lost its Europa League semifinal, while suggesting the referee aided the English hosts.
Villarreal saw its 1-0 first-leg lead overturned by Liverpool, which triumphed 3-0 at Anfield on Thursday.
An own goal from Bruno put Villarreal on the back foot early, before Daniel Sturridge and Adam Lallana completed the comeback in the second half.
But Marcelino was left frustrated by Liverpool and the officiating after seeing Victor Ruiz sent off with 19 minutes remaining.