Marcel Sabitzer was at the double as a pair of Hugo Lloris errors condemned Tottenham to defeat at RB Leipzig and a Champions League exit.
Pierre-Emerick Aubameyang made an impact as a substitute versus Slavia Prague but Mikel Arteta felt he got Arsenal's starting line-up right.
Tottenham face a battle to secure a top-four Premier League finish, with Son Heung-min issuing a rallying cry to his team-mates.
Marko Grujic and Sergio Conceicao both felt Porto deserved more from their first leg against Chelsea, but they are not giving up hope.
Thomas Tuchel discussed the performances of Timo Werner and Kai Havertz in Chelsea's win over Porto midweek.
Hansi Flick spoke to the media after Bayern Munich's defeat at home to Paris Saint-Germain on Wednesday.
Paris Saint-Germain followed up their 4-1 Champions League win at Barcelona with a different kind of triumph, 3-2 at Bayern Munich.