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.

Sarah Keane Confirmed As CEO Of Cricket Ireland
Jason Holland Will Step Down As Assistant Coach With New Zealand
Thursday Morning Sports Update
Wednesday Evening Sport's Update
Cutting Inter-County To Sevens Months Is 'Achievable' Says Gaelic Player Association CEO
Kildare's Lauren Walsh Will Play At Golf's Wistron Ladies Open On Friday
Wednesday Morning Sports Update
SSE Airtricity First Division And Shamrock Rovers Players Named In ROI Squad For The Under-17's World Cup