UEFA Europa League – Semi-finals (First Leg)

25 April 2013

Basel – Chelsea
Referee: Pavel Kralovec (CZE, photo)
Assistant Referee 1: Roman Slysko (SVK)
Assistant Referee 2: Martin Wilczek (CZE)
Additional AR 1: Radek Príhoda (CZE)
Additional AR 2: Michal Patak (CZE)
Fourth Official: Antonin Kordula (CZE)
Referee Observer: Herbert Fandel (GER)

Fenerbahce – Benfica
Referee: Milorad Mazic (SRB)
Assistant Referee 1: Milovan Ristic (SRB)
Assistant Referee 2: Igor Radojcic (SRB)
Additional AR 1: Danilo Grujic (SRB)
Additional AR 2: Miodrag Gogic (SRB)
Fourth Official: Dalibor Djurdjevic (SRB)
Referee Observer: Terje Hauge (NOR)