UEFA Europa League – Quarter-finals (First Leg)

29 March 2012
FC Schalke – Athletic Bilbao
Referee: Pedro Proenca (POR, photo)
Assistant Referee 1: Bertino Miranda (POR)
Assistant Referee 2: Ricardo Santos (POR)
Additional AR 1: Manuel De Sousa (POR)
Additional AR 2: Duarte Gomes (POR)
Fourth Official: Joao Capela (POR)

AZ Alkmaar – Valencia CF
Referee: Martin Atkinson (ENG)
Assistant Referee 1: Michael Mullarkey (ENG)
Assistant Referee 2: Peter Kirkup (ENG)
Additional AR 1: Michael Oliver (ENG)
Additional AR 2: Michael Jones (ENG)
Fourth Official: Andre Marriner (ENG)

Atletico Madrid – Hannover

Referee Stephane Lannoy (FRA)
Assistant Referee 1: Eric Dansault (FRA)
Assistant Referee 2: Frederic Cano (FRA)
Additional AR 1: Fredy Fautrel (FRA)
Additional AR 2: Ruddy Buquet (FRA)
Fourth Official: Antony Gautier (FRA)

Sporting – Metalist
Referee: Wolfgang Stark (GER)
Assistant Referee 1: Jan-Hendrik Salver (GER)
Assistant Referee 2: Guido Kleve (GER)
Additional AR 1: Florian Meyer (GER)
Additional AR 2: Deniz Aytekin (GER)
Fourth Official: Manuel Grafe (GER)