Real Madrid are in group A along with PSG, Brugge and Galatasaray. Here is the timetable in group stage.
Match Day 1 18 Sep (18:55 CET)
PSG vs Madrid
Match Day 2 1 Oct (18:55 CET)
Madrid vs Brugge
Match Day 3 22 Oct (21:00 CET)
Galatasaray vs Madrid
Match Day 4 6 Nov (21:00 CET)
Madrid vs Galatasaray
Match Day 5 26 Nov (21:00 CET)
Madrid vs PSG
Match Day 6 11 Dec (21:00 CET)
Brugge vs Madrid