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| I | Crvena Zvezda | - | RB Salzburg | 0:0 (0:0) | ||
| V | RB Salzburg | - | Crvena Zvezda | 2:2 (1:0) | ||
| I: 21.08.2018 21:00 | V: 29.08.2018 21:00 | Campeones: Crvena Zvezda | ||||
| I | BATE Borisov | - | PSV | 2:3 (1:1) | ||
| V | PSV | - | BATE Borisov | 3:0 (2:0) | ||
| I: 21.08.2018 21:00 | V: 29.08.2018 21:00 | Campeones: PSV | ||||
| I | Benfica | - | PAOK Saloniki | 1:1 (1:0) | ||
| V | PAOK Saloniki | - | Benfica | 1:4 (1:3) | ||
| I: 21.08.2018 21:00 | V: 29.08.2018 21:00 | Campeones: Benfica | ||||
| I | BSC Young Boys | - | Dinamo Zagreb | 1:1 (1:1) | ||
| V | Dinamo Zagreb | - | BSC Young Boys | 1:2 (1:0) | ||
| I: 22.08.2018 21:00 | V: 28.08.2018 21:00 | Campeones: BSC Young Boys | ||||
| I | MOL Vidi FC | - | AEK Athen | 1:2 (0:1) | ||
| V | AEK Athen | - | MOL Vidi FC | 1:1 (0:0) | ||
| I: 22.08.2018 21:00 | V: 28.08.2018 21:00 | Campeones: AEK Athen | ||||
| I | AFC Ajax | - | Dinamo Kiev | 3:1 (3:1) | ||
| V | Dinamo Kiev | - | AFC Ajax | 0:0 (0:0) | ||
| I: 22.08.2018 21:00 | V: 28.08.2018 21:00 | Campeones: AFC Ajax | ||||
