Timo Werner was substituted before RB Leipzig turned things around against Zenit and Julian Nagelsmann was unhappy with the striker.
Lucien Favre was relatively happy with Borussia Dortmund's performance in their 2-0 loss to Inter.
Alex Oxlade-Chamberlain enjoyed a night to remember against Genk but Jurgen Klopp is eyeing individual and collective improvement.
Barcelona must learn to control matches against robust opponents, according to Ernesto Valverde, who admired Slavia Prague's display.
Lee Johnson's Bristol City left it late but claimed all three points against Charlton Athletic, while Fulham beat Luton Town 3-2.
Napoli star Dries Mertens' double at Salzburg in the Champions League on Wednesday was special for many reasons.
Concussion substitutes could be introduced into football should an International Football Association Board study prove they are feasible.
Liverpool beat Genk 4-1 thanks largely to a brace from Alex Oxlade-Chamberlain, who completed a gruelling road back to the Champions League.