Bayer Leverkusen and Lokomotiv Moskva have never met but each will know the value of a positive start in Group D.
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Paris Saint-Germain have been full of goals in recent years, but is Neymar or Kylian Mbappé the better pick?
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UEFA.com looks at the numbers to see which players have done well in the group stage in years gone by.
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Holders Liverpool came close to having their campaign ended by Napoli last season as the teams reconvene at the Stadio San Paolo.
Borussia Dortmund and Barcelona both had their campaigns ended by English teams in 2018/19 and now meet for the first time in 20 years.
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Chelsea won the UEFA Europa League last season, beating an Arsenal side who had ousted Valencia in the semi-finals.
Semi-finalists last season, Ajax have come through qualifying again to take on a LOSC Lille side featuring for the first time in seven years.
Slavia are making only their second group appearance, and kick off Group F with a trip to San Siro to take on Inter.
What is each club's pedigree? Who are their key players, new faces and ones to watch? UEFA.com has all the answers.
Lyon and Zenit reached the round of 16 of the 2018/19 UEFA Champions League and UEFA Europa League respectively.
Leipzig were paired with Portuguese giants on their 2017/18 debut and face a similar task this season against Benfica.
Javi Martinez future still undecided with midfielder yet to discuss Bayern Munich contract extension
In the group stage for the first time since 1994, Salzburg kick off against a Genk side making their first appearance in eight years.
What is each club's pedigree? Who are their key players, new faces and ones to watch? UEFA.com has all the answers.
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What is each club's pedigree? Who are their key players, new faces and ones to watch? UEFA.com has all the answers.
What is each club's pedigree? Who are their key players, new faces and ones to watch? UEFA.com has all the answers.
What is each club's pedigree? Who are their key players, new faces and ones to watch? UEFA.com has all the answers.
What is each club's pedigree? Who are their key players, new faces and ones to watch? UEFA.com has all the answers.