Barcelona (ESP)
UEFA coefficient ranking: 9
How they qualified: Spanish champions
Last season: Group stage, Europa League round of 32
Best European Cup performance: Winners (1991/92, 2005/06, 2008/09, 2010/11, 2014/15)
Did you know?
Barcelona had made it through the group stage every year from 2001/02 until these past two seasons.
Porto (POR)
UEFA coefficient ranking: 20
How they qualified: Second in Portugal
Last season: Round of 16 (L0-1agg vs Inter)
Best European Cup performance: Winners (1986/87, 2003/04)
Did you know?
Porto are embarking on their 26th Champions League group stage campaign (the same number as Bayern). Only Barcelona and Real Madrid (27) have appeared in more.
Shakhtar Donetsk (UKR)
UEFA coefficient ranking: 25
How they qualified: Ukrainian champions
Last season: Group stage, Europa League round of 16
Best European Cup performance: Quarter-finals (2010/11)
Did you know?
Shakhtar have reached the group stage for the 18th time but not gone further in 13 of the previous 17 campaigns, including the last five.
Antwerp (BEL)
UEFA coefficient ranking: 96
How they qualified: Belgian champions, play-off winners (W3-1agg vs AEK Athens)
Last season: Europa Conference League play-offs
Best European Cup performance: Round of 16 (1957/58)
Did you know?
Antwerp is the oldest Belgian football club, founded in 1880. They played the final of the UEFA Cup Winners' Cup in 1993 – the last club final to feature a Belgian team. This will be their first ever Champions League group-stage campaign.