Първи предварителен квалификационен кръг.

Group 1 (seeded sides in bold)

Nõmme Kalju (EST) v Shkëndija (MKD)
Sūduva (LTU) v Crvena zvezda (SRB)
Ararat-Armenia (ARM) v AIK (SWE)
Astana (KAZ) v CFR Cluj (ROU)
Ludogorets (BUL) v Ferencváros (HUN)

Group 2 (seeded sides in bold)

Celtic (SCO) v Sarajevo (BIH)
Sheriff Tiraspol (MDA) v Saburtalo (GEO)
F91 Dudelange (LUX) v Valletta (MLT)
Partizani (ALB) v Qarabağ (AZE)
Slovan Bratislava (SVK) v Sutjeska (MNE)

Group 3 (seeded sides in bold)

Linfield (NIR) v Rosenborg (NOR)
Valur Reykjavík (ISL) v Maribor (SVN)
Dundalk (IRL) v Riga (LVA)
The New Saints (WAL) v Winners of the preliminary round
HJK Helsinki (FIN) v HB Tórshavn (FRO)
BATE Borisov (BLR) v Piast Gliwice (POL