First Leg, 21-22 August 2012
Helsingborg – Celtic
Referee: Olegario Benquerença (POR, photo)
Assistant Referee 1: Bertino Miranda (POR)
Assistant Referee 2: Joao Santos (POR)
Additional AR 1: Artur Soares (POR)
Additional AR 2: Carlos Xistra (POR)
Fourth Official: Ricardo Santos (POR)
Referee Observer: Peter Mikkelsen (DEN)
Spartak Moskva – Fenerbahce
Referee: Martin Atkinson (ENG)
Assistant Referee 1: Peter Kirkup (ENG)
Assistant Referee 2: Stuart Burt (ENG)
Additional AR 1: Michael Oliver (ENG)
Additional AR 2: Michael Jones (ENG)
Fourth Official: Stephen Child (ENG)
Referee Observer: Andreas Schluchter (SUI)
Monchengladbach – Dynamo Kyiv
Referee: Pedro Proenca (POR)
Assistant Referee 1: Tiago Trigo (POR)
Assistant Referee 2: Venancio Tome (POR)
Additional AR 1: Duarte Gomes (POR)
Additional AR 2: Joao Capela (POR)
Fourth Official: Rui Tavares (POR)
Referee Observer: Kaj Natri (FIN)
Kobenhavn – OSC Lille
Referee: Marijo Strahonja (CRO)
Assistant Referee 1: Sinisa Premuzaj (CRO)
Assistant Referee 2: Igor Krmar (CRO)
Additional AR 1: Igor Pristovnik (CRO)
Additional AR 2: Ante Vucemilovic-Simunovic (CRO)
Fourth Official: Goran Pataki (CRO)
Referee Observer: Jaap Uilenberg (NED)
Basel – CFR Cluj
Referee: Jonas Eriksson (SWE)
Assistant Referee 1: Mathias Klasenius (SWE)
Assistant Referee 2: Daniel Warnmark (SWE)
Additional AR 1: Martin Strombergsson (SWE)
Additional AR 2: Tobias Mattsson (SWE)
Fourth Official: Stefan Wittberg (SWE)
Referee Observer: Wilfried Heitmann (GER)
Bate – Hapoel Kiryat
Referee: Howard Webb (ENG)
Assistant Referee 1: Michael Mullarkey (ENG)
Assistant Referee 2: Darren Cann (ENG)
Additional AR 1: Anthony Taylor (ENG)
Additional AR 2: Kevin Friend (ENG)
Fourth Official: Simon Beck (ENG)
Referee Observer: Zoran Petrovic (SRB)
AEL Limasol – Anderlecht
Referee: Milorad Mazic (SRB)
Assistant Referee 1: Milovan Ristic (SRB)
Assistant Referee 2: Igor Radojcic (SRB)
Additional AR 1: Milenko Vukadinovic (SRB)
Additional AR 2: Miodrag Gogic (SRB)
Fourth Official: Vladimir Jovanovic (SRB)
Referee Observer: Michael Riley (ENG)
Dinamo Zagreb – NK Maribor
Referee: Cuneyt Cakir (TUR)
Assistant Referee 1: Bahattin Duran (TUR)
Assistant Referee 2: Tarik Ongun (TUR)
Additional AR 1: Huseyin Gocek (TUR)
Additional AR 2: Suleyman Abay (TUR)
Fourth Official: Orkun Aktas (TUR)
Referee Observer: Konrad Plautz (AUT)
Braga – Udinese
Referee: Wolfgang Stark (GER)
Assistant Referee 1: Jan-Hendrik Salver (GER)
Assistant Referee 2: Mike Pickel (GER)
Additional AR 1: Marco Fritz (GER)
Additional AR 2: Tobias Welz (GER)
Fourth Official: Guido Kleve (GER)
Referee Observer: Miroslav Liba (CZE)
Malaga – Panathinaikos
Referee: Tony Chapron (FRA)
Assistant Referee 1: Fredji Harchay (FRA)
Assistant Referee 2: Huseyin Ocak (FRA)
Additional AR 1: Said Ennjimi (FRA)
Additional AR 2: Olivier Thual (FRA)
Fourth Official: Emmanuel Boisdenghien (FRA)
Referee Observer: Alan Snoddy (NIR)