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An update: we now know all but one team in the 3rd qualifying round of the CL. (The as-yet unknown team will come from Greece and could be either PAOK, AEK Athens or Panathinaikos).
So the League Route part of the third qualifying round will look like this:
SEEDED--Shaktar Donetsk, Ajax, Anderlecht, Fenerbahce, Sparta Prague
UNSEEDED--Steaua Bucharest, Monaco, Young Boys, Rostov, Greek representative
The five winners of those matches go into the Play-off round.
If the seeded teams in the 3rd qualifying round all win, the Play-off round would look like:
SEEDED TEAMS
Manchester City, Porto, Shaktar Donetsk, VILLARREAL, Ajax
UNSEEDED TEAMS
Andelecht, Roma, Borussia Munchengladbach, Fenerbahce, Sparta Prague
Within each group, these are listed in coefficient order. Therefore, should Shaktar and/or Ajax lose their third-round match, Anderlecht and/or Roma would move up to be seeded teams. If Shaktar and Ajax both lose, and Anderlecht also loses, then Gladbach would become a seeded team along with Roma. That's probably not too likely.