Celtic 2018 schedule
| Aug 23 | @FK Suduva | T | 1–1 |
| Aug 30 | FK Suduva | W | 3–0 |
| Sep 20 | Rosenborg | W | 1–0 |
| Oct 4 | @RB Salzburg | L | 3–1 |
| Oct 25 | @RB Leipzig | L | 2–0 |
| Nov 8 | RB Leipzig | W | 2–1 |
| Nov 29 | @Rosenborg | W | 1–0 |
| Dec 13 | RB Salzburg | L | 2–1 |
| Feb 14 | Valencia | L | 2–0 |
| Feb 21 | @Valencia | L | 1–0 |