The following referees will be in charge of the second set of games to be played on Wednesday, as first legs of 2018/19 UCL play-offs.
22 August 2018, 21:00 CET - Berne (Stade de Suisse Wankdorf)
BSC Young Boys (SUI) - FK Dinamo Zagreb (CRO)
Referee: Alberto Undiano Mallenco (ESP)
Assistant Referee 1: Roberto Alonso Fernández (ESP)
Assistant Referee 2: Juan Carlos Yuste Jiménez (ESP)
Fourth Official: Raúl Cabañero Martínez (ESP)
Additional Assistant Referee 1: Juan Martínez Munuera (ESP)
Additional Assistant Referee 2: José María Sánchez Martínez (ESP)
UEFA Referee Observer: Kaj Østergaard (DEN)
UEFA Delegate: Arturs Gaidels (LVA)
22 August 2018, 21:00 CET - Budapest (Groupama Aréna)
MOL Vidi FC (HUN) - AEK Athens FC (GRE)
Referee: Gianluca Rocchi (ITA)
Assistant Referee 1: Elenito Giovanni Di Liberatore (ITA)
Assistant Referee 2: Mauro Tonolini (ITA)
Fourth Official: Fabiano Preti (ITA)
Additional Assistant Referee 1: Luca Banti (ITA)
Additional Assistant Referee 2: Massimiliano Irrati (ITA)
UEFA Referee Observer: Miroslav Tulinger (CZE)
UEFA Delegate: Metin Kazancıoğlu (TUR)
22 August 2018, 21:00 CET - Amsterdam (Johan Cruijff ArenA)
AFC Ajax (NED) - FC Dynamo Kyiv (UKR)
Referee: Clément Turpin (FRA)
Assistant Referee 1: Nicolas Danos (FRA)
Assistant Referee 2: Cyril Gringore (FRA)
Fourth Official: Guillaume Debart (FRA)
Additional Assistant Referee 1: Ruddy Buquet (FRA)
Additional Assistant Referee 2: Nicolas Rainville (FRA)
UEFA Referee Observer: Levan Paniashvili (GEO)
UEFA Delegate: Geir Þorsteinsson (ISL)
