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The draw: Astana v APOEL, Skënderbeu v Dinamo Zagreb, Celtic v Malmö, Basel v Maccabi Tel-Aviv, BATE v Partizan, Lazio v Bayer Leverkusen, Manchester United v Club Brugge, Sporting CP v CSKA Moskva, Rapid v Shakhtar, Valencia v Monaco.
When? Proceedings begin at 12.00CET and will be streamed live on UEFA.com.
Where? The draw is made at UEFA headquarters in Nyon.
Coverage: UEFA.com's DrawCentre will have build-up, live streaming and reaction during the course of the day.
Who? There will be 20 teams involved: ten in the champions route and ten in the league route.
Seeded: Manchester United (ENG), Valencia (ESP), Bayer Leverkusen (GER), Shakhtar Donetsk (UKR), Sporting CP (POR)
Unseeded: CSKA Moskva (RUS), Lazio (ITA), Club Brugge (BEL), AS Monaco (FRA), Rapid Wien (AUT)
Seeded: FC Basel (SUI), Celtic (SCO), APOEL (CYP), BATE Borisov (BLR), Dinamo Zagreb (CRO)
Unseeded: Maccabi Tel-Aviv (ISR), Partizan (SRB), Malmö (SWE), Skënderbeu (ALB), Astana (KAZ)
• The teams with the five highest coefficients in each route – this applies to both League and Champions – are seeded and drawn against the other five teams in that route.
• To determine each tie, one side apiece from the seeded and non-seeded pots will be drawn and placed in another pot, with the first of the two to then be picked out at home in the first leg.
• Due to the restriction in Russian and Ukrainian clubs meeting, Shakhtar cannot be drawn against CSKA Moskva.
Ties will be played on 18/19 & 25/26 August, the ten winners joining the 22 clubs automatically qualified for the group stage.