In each group, teams play against each other home-and-away in a round-robin format. The group winners and runners-up advance to the round of 16, while the third-placed teams enter the 2020–21 UEFA Europa League round of 32. The matchdays are 20–21 October, 27–28 October, 3–4 November, 24–25 November, 1–2 December and 8–9 December 2020.