The draw is due to take place at around 11.00 a.m. BST on Friday, July 14.
The ties will take place on July 25/26 and Aug 1/2..
Seeded: Dynamo Kiev, Ajax, Viktoria Plzen, CSKA Moscow, Club Brugge
Unseeded: Steaua Bucharest, Young Boys, Nice, Istanbul Basaksehir, AEK Athens
Entering in final qualifying round: Sevilla, Napoli, Liverpool, Sporting CP, Hoffenheim
Olympiakos are the only seeded team who will enter at this stage, with Slavia Prague and Viitorul Constanta unseeded. The remaining 17 teams will be drawn as either/or based upon who qualifies from the second qualifying round ties, which are completed next week.
Follow @ESPNFC on Twitter to keep up with the latest football updates.