UEFA Europa League – Quarter-finals (Second Leg)

5 April 2012
Athletic Bilbao – Schalke
Referee: Nicola Rizzoli (ITA, photo)
Assistant Referee 1: Renato Faverani (ITA)
Assistant Referee 2: Andrea Stefani (ITA)
Additional AR 1: Paolo Tagliavento (ITA)
Additional AR 2: Andrea de Marco (ITA)
Fourth Official: Luca Banti (ITA)

Valencia CF – AZ Alkmaar
Referee: Pavel Kralovec (CZE)
Assistant Referee 1: Martin Wilczek (CZE)
Assistant Referee 2: Antonin Kordula (CZE)
Additional AR 1: Miroslav Zelinka (CZE)
Additional AR 2: Radek Prihoda (CZE)
Fourth Official: Libor Kovarik (CZE)

Hannover – Atletico Madrid
Referee: Mark Clattenburg (ENG)
Assistant Referee 1: Michael Mullarkey (ENG)
Assistant Referee 2: Stephen Child (ENG)
Additional AR 1: Anthony Taylor (ENG)
Additional AR 2: Andre Marriner (ENG)
Fourth Official: Michael Dean (ENG)

Metalist – Sporting
Referee: William Collum (SCO)
Assistant Referee 1: Derek Rose (SCO)
Assistant Referee 2: Alasdair Ross (SCO)
Additional AR 1: Euan Norris (SCO)
Additional AR 2: Steven McLean (SCO)
Fourth Official: Robert Madden (SCO)