Who's in Group A?

Benfica (POR)

• UEFA coefficient ranking: 9

• How they qualified: first in Portuguese Liga

• Previous group stage campaigns: 12 (last appearance: 2016/17)

• Last season: UEFA Champions League round of 16

• Best European Cup performance: winners x 2 (1960/61, 1961/62)

Manchester United (ENG)

• UEFA coefficient ranking: 15

• How they qualified: UEFA Europa League winners

• Previous group stage campaigns: 20 (last appearance: 2015/16)

• Last season: UEFA Europa League winners

• Best European Cup performance: winners x 3 (1967/68, 1998/99, 2007/08)

Basel stun United in 2011 ©Getty Images

Basel (SUI)

• UEFA coefficient ranking: 22

• How they qualified: first in Swiss Super League

• Previous group stage campaigns: 7 (last appearance: 2016/17)

• Last season: UEFA Champions League group stage

• Best European Cup performance: quarter-finals (1973/74)

CSKA Moskva (RUS)

• UEFA coefficient ranking: 52

• How they qualified: second in Russian Premier-Liga, play-off winners

• Previous group stage campaigns: 10 (last appearance: 2016/17)

• Last season: UEFA Champions League group stage

• Best European Cup performance: quarter-finals (2009/10)

Matchday one fixtures (Tuesday 12 September)

Benfica v CSKA Moskva

Manchester United v Basel

Log in for free to watch the highlights 1968 final: United 4-1 Benfica

Key facts

• Manchester United became the first English club to win the European Cup with a 4-1 extra-time victory against Benfica in the 1968 final at Wembley, Bobby Charlton scoring twice. United have won six of their nine fixtures against Benfica, losing just once.

• CSKA beat Benfica 3-1 on aggregate in the round of 32 during their victorious 2004/05 UEFA Cup campaign.

• This will be the third time United and CSKA have been in the same UEFA Champions League group, after 2009/10 and 2015/16. United won two of those games, the other two ending all square.

• United's 2011/12 UEFA Champions League campaign was ended by Basel, who beat the Manchester club 2-1 in Switzerland on matchday six to progress at their expense.