Pain in Spain for Bhoys
Sonny Anderson and Roger Garcia capitalised on some sloppy play in the Hoops backline by Bobo Balde and Joos Valgaeren in each half to guide Villarreal into the last four.
Celtic's chances were hit before kick-off when Chris Sutton failed to recover from a groin injury. The Hoops were already weakened by the suspension of Alan Thompson.