Twenty-five teams enter the frame to join 33 second qualifying round winners.
13:00CET, 14 July, Nyon
- Draw procedure
• In the seeding pots released on the morning of the draw, the teams are ranked by their coefficient or, in the case of clubs emerging from the 33 second qualifying round ties (played on 13 and 20 July), by the higher of the two coefficients involved in those matches – with 29 sides in total classified as seeded.
• The teams are further split into groups containing an equal number of seeded and unseeded contenders. Each seeded club will meet an unseeded opponent from within the same sub-group.
• Ties played on 27 July and 3 August.