The Reds are very confident of securing victory over their Spanish opponent and reaching the final of Europe's secondary club competition, according to the Welsh midfielder.
Joe Allen is optimistic Liverpool can overturn the first-leg deficit against Villarreal and reach the Europa League final.
The two teams meet at Anfield for Thursday's semifinal second leg after the Spanish side won the opening encounter 1-0 at El Madrigal thanks to Adrian Lopez's stoppage-time strike.
The winner of the tie will face either Sevilla or Shakhtar Donetsk in the final in Basel on May 18 and midfielder Allen is confident Liverpool will be there.