Schalke fans unveiled a banner showing apparent support for the man convicted of carrying out a 2017 bomb attack on Dortmund's team bus.
Marco Reus accepted full culpability for his red-card challenge on Suat Serdar in Borussia Dortmund's damaging 4-2 loss to rivals Schalke.
Lucien Favre took aim at the officials after Borussia Dortmund's derby defeat to Schalke left their Bundesliga title hopes "done".
Borussia Dortmund took an early lead against Schalke but finished the Revierderby with nine men and their Bundesliga hopes in tatters.
Schalke announced that McKennie has a ruptured ankle ligament as feared after going down in action for the United States.
Schalke have announced that Weston McKennie has a ruptured ankle ligament as feared after going down in action for the United States.
After returning for a third stint with Schalke, Huub Stevens is happy to offer second chances to the club's underperforming squad.
Schalke were humiliated by a 7-0 defeat to Manchester City in the Champions League on Tuesday and coach Domenico Tedesco has been sacked.
Phil Foden opened his Champions League account in a dazzling cameo against Schalke and the 18-year-old will continue to learn at Man City.
Liverpool could make it four Premier League teams in the Champions League quarters, but Pep Guardiola hopes they lose to Bayern Munich.