UEFA Europa League – Semi-finals (First Leg)

19 April 2012
Sporting Lisbon – Athletic Bilbao
Referee: Jonas Eriksson (SWE, photo)
Assistant Referee 1: Stefan Wittberg (SWE)
Assistant Referee 2: Mathias Klasenius (SWE)
Additional AR 1: Markus Strombergsson (SWE)
Additional AR 2: Stefan Johannesson (SWE)
Fourth Official: Daniel Stalhammar (SWE)

Atletico Madrid – Valencia CF
Referee: Craig Thomson (SCO)
Assistant Referee 1: Alasdair Ross (SCO)
Assistant Referee 2: Derek Rose (SCO)
Additional AR 1: William Collum (SCO)
Additional AR 2: Robert Madden (SCO)
Fourth Official: Steven McLean (SCO)