| 11 Jul 18 | r00  | RabotnickiRabotnicki | 2 - 1 | Kispest HonvedKispest Honve |
| 11 Jul 18 | r00 | VaduzVaduz | 1 - 0 | Levski Sofia Levski Sofia |
| 12 Jul 18 | r00 | Pyunik Pyunik | 1 - 0 | VardarVardar |
| 12 Jul 18 | r00 | ChikhuraChikhura | 0 - 0 | Beitar JerusalemBeitar Jerusa |
| 12 Jul 18 | r00 | KuPS KuopioKuPS Kuopio | 0 - 1 | FC CopenhagenFC Copenhagen |
| 12 Jul 18 | r00 | FC Levadia Tallinn FC Levadia Ta | 0 - 1 | DundalkDundalk |
| 12 Jul 18 | r00 | Trans Narva Trans Narva | 0 - 2 | Zeljeznicar SarajevoZeljeznicar S |
| 12 Jul 18 | r00 | FC Milsami FC Milsami | 2 - 4 | Slovan Bratislava Slovan Bratis |
| 12 Jul 18 | r00 | FerencvarosFerencvaros | 1 - 1 | Maccabi Tel AvivMaccabi Tel A |
| 12 Jul 18 | r00 | Derry CityDerry City | 0 - 2 | Din. MinskDin. Minsk |
| 12 Jul 18 | r00 | VestmannaeyjarVestmannaeyja | 0 - 4 | Sarpsborg 08Sarpsborg 08 |
| 12 Jul 18 | r00 | Siroki Brijeg Siroki Brijeg | 2 - 2 | DomzaleDomzale |
| 12 Jul 18 | r00 | Shamrock Shamrock | 0 - 1 | AIKAIK |
| 12 Jul 18 | r00 | Rudar Pljevlja Rudar Pljevlj | 0 - 3 | Partizan BelgradePartizan Belg |
| 12 Jul 18 | r00 | Buducnost Podgorica Buducnost Pod | 0 - 2 | TrencinTrencin |
| 12 Jul 18 | r00 | HibernianHibernian | 6 - 1 | NSI RunavikNSI Runavik |
| 12 Jul 18 | r00 | Lech PoznanLech Poznan | 2 - 0 | Gandzasar KapanGandzasar Kap |
| 12 Jul 18 | r00 | Cliftonville Cliftonville | 0 - 1 | FC NordsjællandFC Nordsjælla |
| 12 Jul 18 | r00 | StjarnanStjarnan | 3 - 0 | Nomme KaljuNomme Kalju |
| 17 Jul 18 | r00 | Kispest HonvedKispest Honve | 4 - 0 | RabotnickiRabotnicki |
| 17 Jul 18 | r00 | Levski Sofia Levski Sofia | 3 - 2 | VaduzVaduz |
| 18 Jul 18 | r00 | Zeljeznicar SarajevoZeljeznicar S | 3 - 1 | Trans Narva Trans Narva |
| 19 Jul 18 | r00 | VardarVardar | 0 - 2 | Pyunik Pyunik |
| 19 Jul 18 | r00 | Beitar JerusalemBeitar Jerusa | 1 - 2 | ChikhuraChikhura |
| 19 Jul 18 | r00 | FC CopenhagenFC Copenhagen | 1 - 1 | KuPS KuopioKuPS Kuopio |
| 19 Jul 18 | r00 | DundalkDundalk | 2 - 1 | FC Levadia Tallinn FC Levadia Ta |
| 19 Jul 18 | r00 | Slovan Bratislava Slovan Bratis | 5 - 0 | FC Milsami FC Milsami |
| 19 Jul 18 | r00 | Maccabi Tel AvivMaccabi Tel A | 1 - 0 | FerencvarosFerencvaros |
| 19 Jul 18 | r00 | Din. MinskDin. Minsk | 1 - 2 | Derry CityDerry City |
| 19 Jul 18 | r00 | Sarpsborg 08Sarpsborg 08 | 2 - 0 | VestmannaeyjarVestmannaeyja |
| 19 Jul 18 | r00 | DomzaleDomzale | 1 - 1 | Siroki Brijeg Siroki Brijeg |
| 19 Jul 18 | r00 | AIKAIK | 1 - 1 | Shamrock Shamrock |
| 19 Jul 18 | r00 | Partizan BelgradePartizan Belg | 3 - 0 | Rudar Pljevlja Rudar Pljevlj |
| 19 Jul 18 | r00 | TrencinTrencin | 1 - 1 | Buducnost Podgorica Buducnost Pod |
| 19 Jul 18 | r00 | NSI RunavikNSI Runavik | 4 - 6 | HibernianHibernian |
| 19 Jul 18 | r00 | Gandzasar KapanGandzasar Kap | 2 - 1 | Lech PoznanLech Poznan |
| 19 Jul 18 | r00 | FC NordsjællandFC Nordsjælla | 2 - 1 | Cliftonville Cliftonville |
| 19 Jul 18 | r00 | Nomme KaljuNomme Kalju | 1 - 0 | StjarnanStjarnan |
| 26 Jul 18 | r00 | DundalkDundalk | 0 - 0 | AEK LarnacaAEK Larnaca |
| 02 Aug 18 | r00 | AEK LarnacaAEK Larnaca | 4 - 0 | DundalkDundalk |
| 07 Aug 18 | r00 | Pyunik Pyunik | 0 - 0 | Maccabi Tel AvivMaccabi Tel A |
| 09 Aug 18 | r00 | AlashkertAlashkert | 0 - 1 | CFR Cluj-NapocaCFR Cluj-Napo |
| 09 Aug 18 | r00 | Hapoel HaifaHapoel Haifa | 1 - 4 | AtalantaAtalanta |
| 09 Aug 18 | r00 | Torpedo Kutaisi Torpedo Kutai | 5 - 2 | KukesiKukesi |
| 09 Aug 18 | r00 | Hapoel Beer ShevaHapoel Beer S | 2 - 2 | Apoel NicosiaApoel Nicosia |
| 09 Aug 18 | r00 | Ludogorets Razgrad Ludogorets Ra | 1 - 0 | ZrinjskiZrinjski |
| 09 Aug 18 | r00 | TrencinTrencin | 4 - 0 | FeyenoordFeyenoord |
| 09 Aug 18 | r00 | IllichivetsIllichivets | 1 - 3 | BordeauxBordeaux |
| 09 Aug 18 | r00 | Din. MinskDin. Minsk | 4 - 0 | Zenit St PetersburgZenit St Pete |
| 09 Aug 18 | r00 | Jagiellonia BialystokJagiellonia B | 0 - 1 | GentGent |
| 09 Aug 18 | r00 | CSKA SofiaCSKA Sofia | 1 - 2 | FC CopenhagenFC Copenhagen |
| 09 Aug 18 | r00 | FC NordsjællandFC Nordsjælla | 1 - 2 | Partizan BelgradePartizan Belg |
| 09 Aug 18 | r00 | Olimpija Ljubljana Olimpija Ljub | 3 - 0 | HJK HelsinkiHJK Helsinki |
| 09 Aug 18 | r00 | VitesseVitesse | 0 - 1 | FC BaselFC Basel |
| 09 Aug 18 | r00 | GenkGenk | 2 - 0 | Lech PoznanLech Poznan |
| 09 Aug 18 | r00 | Istanbul BasaksehirIstanbul Basa | 0 - 0 | BurnleyBurnley |
| 09 Aug 18 | r00 | ZoryaZorya | 1 - 1 | BragaBraga |
| 09 Aug 18 | r00 | TNSTNS | 0 - 2 | FC Midtjylland FC Midtjyllan |
| 09 Aug 18 | r00 | RangersRangers | 3 - 1 | NK MariborNK Maribor |
| 09 Aug 18 | r00 | Hajduk SplitHajduk Split | 0 - 0 | Steaua BucurestiSteaua Bucure |
| 09 Aug 18 | r00 | HibernianHibernian | 0 - 0 | MoldeMolde |
| 09 Aug 18 | r00 | Sarpsborg 08Sarpsborg 08 | 1 - 1 | RijekaRijeka |
| 09 Aug 18 | r00 | Legia WarsawLegia Warsaw | 1 - 2 | F91 DudelangeF91 Dudelange |
| 09 Aug 18 | r00 | Slovan Bratislava Slovan Bratis | 2 - 1 | Rapid ViennaRapid Vienna |
| 09 Aug 18 | r00 | SevillaSevilla | 1 - 0 | VMFD Zalgiris VMFD Zalgiris |
| 16 Aug 18 | r00 | HJK HelsinkiHJK Helsinki | 1 - 4 | Olimpija Ljubljana Olimpija Ljub |
| 16 Aug 18 | r00 | FC CopenhagenFC Copenhagen | 2 - 1 | CSKA SofiaCSKA Sofia |
| 16 Aug 18 | r00 | KukesiKukesi | 2 - 0 | Torpedo Kutaisi Torpedo Kutai |
| 16 Aug 18 | r00 | Apoel NicosiaApoel Nicosia | 3 - 1 | Hapoel Beer ShevaHapoel Beer S |
| 16 Aug 18 | r00 | FC Midtjylland FC Midtjyllan | 3 - 1 | TNSTNS |
| 16 Aug 18 | r00 | CFR Cluj-NapocaCFR Cluj-Napo | 5 - 0 | AlashkertAlashkert |
| 16 Aug 18 | r00 | VMFD Zalgiris VMFD Zalgiris | 0 - 5 | SevillaSevilla |
| 16 Aug 18 | r00 | MoldeMolde | 3 - 0 | HibernianHibernian |
| 16 Aug 18 | r00 | Zenit St PetersburgZenit St Pete | 8 - 1 | Din. MinskDin. Minsk |
| 16 Aug 18 | r00 | Maccabi Tel AvivMaccabi Tel A | 2 - 1 | Pyunik Pyunik |
| 16 Aug 18 | r00 | F91 DudelangeF91 Dudelange | 2 - 2 | Legia WarsawLegia Warsaw |
| 16 Aug 18 | r00 | ZrinjskiZrinjski | 1 - 1 | Ludogorets Razgrad Ludogorets Ra |
| 16 Aug 18 | r00 | FC BaselFC Basel | 1 - 0 | VitesseVitesse |
| 16 Aug 18 | r00 | AtalantaAtalanta | 2 - 0 | Hapoel HaifaHapoel Haifa |
| 16 Aug 18 | r00 | NK MariborNK Maribor | 0 - 0 | RangersRangers |
| 16 Aug 18 | r00 | Lech PoznanLech Poznan | 1 - 2 | GenkGenk |
| 16 Aug 18 | r00 | GentGent | 3 - 1 | Jagiellonia BialystokJagiellonia B |
| 16 Aug 18 | r00 | FeyenoordFeyenoord | 1 - 1 | TrencinTrencin |
| 16 Aug 18 | r00 | Rapid ViennaRapid Vienna | 4 - 0 | Slovan Bratislava Slovan Bratis |
| 16 Aug 18 | r00 | Steaua BucurestiSteaua Bucure | 2 - 1 | Hajduk SplitHajduk Split |
| 16 Aug 18 | r00 | Partizan BelgradePartizan Belg | 3 - 2 | FC NordsjællandFC Nordsjælla |
| 16 Aug 18 | r00 | BordeauxBordeaux | 2 - 1 | IllichivetsIllichivets |
| 16 Aug 18 | r00 | BurnleyBurnley | 1 - 0 | Istanbul BasaksehirIstanbul Basa |
| 16 Aug 18 | r00 | RijekaRijeka | 0 - 1 | Sarpsborg 08Sarpsborg 08 |
| 16 Aug 18 | r00 | BragaBraga | 2 - 2 | ZoryaZorya |
| 23 Aug 18 | r00  | F91 DudelangeF91 Dudelange | 2 - 0 | CFR Cluj-NapocaCFR Cluj-Napo |
| 23 Aug 18 | r00 | TrencinTrencin | 1 - 1 | AEK LarnacaAEK Larnaca |
| 23 Aug 18 | r00 | Torpedo Kutaisi Torpedo Kutai | 0 - 1 | Ludogorets Razgrad Ludogorets Ra |
| 23 Aug 18 | r00 | Zenit St PetersburgZenit St Pete | 3 - 1 | MoldeMolde |
| 23 Aug 18 | r00 | Sheriff TiraspolSheriff Tiras | 1 - 0 | Qarabag FKQarabag FK |
| 23 Aug 18 | r00 | Apoel NicosiaApoel Nicosia | 1 - 0 | FC AstanaFC Astana |
| 23 Aug 18 | r00 | Sarpsborg 08Sarpsborg 08 | 3 - 1 | Maccabi Tel AvivMaccabi Tel A |
| 23 Aug 18 | r00  | Malmo FFMalmo FF | 2 - 2 | FC Midtjylland FC Midtjyllan |
| 23 Aug 18 | r00 | OlympiakosOlympiakos | 3 - 1 | BurnleyBurnley |
| 23 Aug 18 | r00 | AtalantaAtalanta | 0 - 0 | FC CopenhagenFC Copenhagen |
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