Villarreal v Liverpool facts: No.3
This is Liverpool's 17th European semi-final and their first in six years.
The Reds are aiming to reach their 12th European final by winning on their sixth appearance in a Europa League/UEFA Cup semi-final.
Three of their previous semi-finals have ended in victory, with Liverpool going on to win the competition on each of those occasions (1973, 1976 and 2001).