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| 1st(1st leg) | Slavia Praha | - | BATE Borisov | 1:0 (1:0) | ||
| 2nd (2nd leg) | BATE Borisov | - | Slavia Praha | 2:1 (1:1) | ||
| 1st(1st leg): 25/07/2017 18:00 | 2nd (2nd leg): 02/08/2017 18:00 | Winner: Slavia Praha | ||||
| 1st(1st leg) | Qarabağ FK | - | FC Sheriff | 0:0 (0:0) | ||
| 2nd (2nd leg) | FC Sheriff | - | Qarabağ FK | 1:2 (0:1) | ||
| 1st(1st leg): 25/07/2017 18:00 | 2nd (2nd leg): 01/08/2017 18:00 | Winner: Qarabağ FK | ||||
| 1st(1st leg) | FCSB | - | Viktoria Plzeň | 2:2 (1:1) | ||
| 2nd (2nd leg) | Viktoria Plzeň | - | FCSB | 1:4 (0:1) | ||
| 1st(1st leg): 25/07/2017 18:30 | 2nd (2nd leg): 02/08/2017 19:15 | Winner: FCSB | ||||
| 1st(1st leg) | AEK Athen | - | CSKA Moskva | 0:2 (0:1) | ||
| 2nd (2nd leg) | CSKA Moskva | - | AEK Athen | 1:0 (0:0) | ||
| 1st(1st leg): 25/07/2017 18:30 | 2nd (2nd leg): 02/08/2017 18:00 | Winner: CSKA Moskva | ||||
| 1st(1st leg) | Vardar Skopje | - | FC København | 1:0 (0:0) | ||
| 2nd (2nd leg) | FC København | - | Vardar Skopje | 4:1 (2:1) | ||
| 1st(1st leg): 25/07/2017 19:00 | 2nd (2nd leg): 02/08/2017 19:00 | Winner: FC København | ||||
| 1st(1st leg) | Partizan | - | Olympiakos Piraeus | 1:3 (1:1) | ||
| 2nd (2nd leg) | Olympiakos Piraeus | - | Partizan | 2:2 (1:1) | ||
| 1st(1st leg): 25/07/2017 19:45 | 2nd (2nd leg): 02/08/2017 19:45 | Winner: Olympiakos Piraeus | ||||
| 1st(1st leg) | FK Astana | - | Legia Warszawa | 3:1 (2:0) | ||
| 2nd (2nd leg) | Legia Warszawa | - | FK Astana | 1:0 (0:0) | ||
| 1st(1st leg): 26/07/2017 15:00 | 2nd (2nd leg): 02/08/2017 19:45 | Winner: FK Astana | ||||
| 1st(1st leg) | Dinamo Kiev | - | BSC Young Boys | 3:1 (2:0) | ||
| 2nd (2nd leg) | BSC Young Boys | - | Dinamo Kiev | 2:0 (1:0) | ||
| 1st(1st leg): 26/07/2017 17:30 | 2nd (2nd leg): 02/08/2017 19:15 | Winner: BSC Young Boys | ||||
| 1st(1st leg) | RB Salzburg | - | HNK Rijeka | 1:1 (0:1) | ||
| 2nd (2nd leg) | HNK Rijeka | - | RB Salzburg | 0:0 (0:0) | ||
| 1st(1st leg): 26/07/2017 17:45 | 2nd (2nd leg): 02/08/2017 19:45 | Winner: HNK Rijeka | ||||
| 1st(1st leg) | Hapoel Be'er Sheva | - | PFC Ludogorets Razgrad | 2:0 (1:0) | ||
| 2nd (2nd leg) | PFC Ludogorets Razgrad | - | Hapoel Be'er Sheva | 3:1 (2:0) | ||
| 1st(1st leg): 26/07/2017 18:00 | 2nd (2nd leg): 02/08/2017 19:30 | Winner: Hapoel Be'er Sheva | ||||
| 1st(1st leg) | FC Viitorul Constanța | - | APOEL Nikosia | 1:0 (0:0) | ||
| 2nd (2nd leg) | APOEL Nikosia | - | FC Viitorul Constanța | 4:0 (0:0, 1:0) aet | ||
| 1st(1st leg): 26/07/2017 19:00 | 2nd (2nd leg): 02/08/2017 18:00 | Winner: APOEL Nikosia | ||||
| 1st(1st leg) | NK Maribor | - | FH Hafnarfjörður | 1:0 (0:0) | ||
| 2nd (2nd leg) | FH Hafnarfjörður | - | NK Maribor | 0:1 (0:0) | ||
| 1st(1st leg): 26/07/2017 19:20 | 2nd (2nd leg): 02/08/2017 19:30 | Winner: NK Maribor | ||||
| 1st(1st leg) | Celtic FC | - | Rosenborg BK | 0:0 (0:0) | ||
| 2nd (2nd leg) | Rosenborg BK | - | Celtic FC | 0:1 (0:0) | ||
| 1st(1st leg): 26/07/2017 19:45 | 2nd (2nd leg): 02/08/2017 19:45 | Winner: Celtic FC | ||||
| 1st(1st leg) | OGC Nice | - | AFC Ajax | 1:1 (1:0) | ||
| 2nd (2nd leg) | AFC Ajax | - | OGC Nice | 2:2 (1:1) | ||
| 1st(1st leg): 26/07/2017 19:45 | 2nd (2nd leg): 02/08/2017 19:45 | Winner: OGC Nice | ||||
| 1st(1st leg) | Club Brugge KV | - | İstanbul Başakşehir | 3:3 (2:0) | ||
| 2nd (2nd leg) | İstanbul Başakşehir | - | Club Brugge KV | 2:0 (2:0) | ||
| 1st(1st leg): 26/07/2017 20:00 | 2nd (2nd leg): 02/08/2017 18:45 | Winner: İstanbul Başakşehir | ||||
