As always the draw will be complicated and convoluted, but UEFA has confirmed the four pots that will make up the group stage.
It is only City that have made it into Pot One for the draw, with United and Spurs in Pot Two and Liverpool down in Pot Three despite reaching the final last season.
Premier League champions City, eliminated by Liverpool in the quarter-finals last term, are in pot one along with defending champions Real Madrid, Europa League winners Atletico Madrid, Barcelona, Bayern Munich, Juventus, Paris Saint-Germain and Lokomotiv Moscow. No teams from the same country can be drawn in the same group and Uefa has also ruled that clubs from Russian Federation and Ukraine cannot face one another.
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What pots are each team in?
As the clock strikes 18:00 CET, the balls will be drawn out and the 32 teams participating in the competition will learn what fate has in store for them in the first step towards the Madrid showpiece. Valencia have made eye-catching signings including Goncalo Guedes from PSG and Chelsea striker Michy Batshuayi - they will be unsafe.
Who is in the Champions League draw?
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Huge clubs lurk in every pot, so there is every chance of a "group of death" scenario unfolding when the draw is made.
Real Madrid beat Sterling's former club Liverpool in the Champions League Final in 17/18 to claim their third consecutive European Trophy.
Red Star hadn't qualified for the Champions League group stage since being the European Cup back in 1991-92, so Degenek's move had no guarantees.
The Dominican will have to wait until after the global break, when Real will play in the Estadio San Mames, on September 15, just days before their first Champions League encounter.
Stranger things have happened, but it does seem a stretch to imagine City not finding an agreement with Sterling, a player who scored 23 times for them last season, in the next year.
An example of a weaker group could be: Lokomotiv, Porto, PSV and Club Brugge.