Halfway stage in the groups and currently out of the top two in their groups are: Monaco, Dortmund, Sevilla, Atletico and Napoli, all of who would have been fancied to qualify for the knock-outs.
A long way to go, obviously, but some of them have a lot of work to do, especially Monaco, Dortmund and Atletico. Might be a tough Europa League again this year.