Overview
- The return leg kicks off Thursday, 28 August at 21:00 CEST at the MEWA Arena in Mainz.
- SWR will broadcast the match free to air, with free streams on Joyn, SWR.de and the ARD-Mediathek.
- Rosenborg won the first meeting in Trondheim 2–1 after Nadiem Amiri scored for Mainz, Dino Islamovic equalised from the spot and Ole Sæter netted a 90th-minute winner.
- Mainz must win by two to advance in regulation, while a one-goal victory such as 1–0 would force extra time.
- Sporting director Christian Heidel and coach Bo Henriksen expressed confidence before the home leg, with goalkeeper Robin Zentner urging more cutting edge after the late defeat.