Man United and Arsenal play Copenhagen and Sevilla respectively
It will be an emotional night at Old Trafford later as Manchester United pay tribute to the late Bobby Charlton before the Champions League match with Copenhagen.
A wreath will be placed on his seat in the Directors' Box and there will be a minute's silence before the match.
The Group A game starts at 8pm.
The other match in that Group sees Galatasaray take on Bayern Munich from 5.45.
In Group B, Arsenal are away to Sevilla from 8pm.
The other tie in that Group involves Lens and PSV Eindhoven.
In Group C, Union Berlin play Napoli and it's Sporting Braga versus Real Madrid.
In Group D, Inter take on Red Bull Salzburg and Benfica meet Real Sociedad.