Borussia Dortmund must put their Bayern Munich loss behind them, head coach Lucien Favre said.
Borussia Dortmund will be without Thomas Delaney until January after the midfielder suffered a serious ankle injury in action for Denmark.
Liverpool fell to a 3-2 pre-season friendly defeat against Borussia Dortmund, but Jurgen Klopp opted to remain positive.
Borussia Dortmund made it two wins from two in the United States after a 3-2 win over Liverpool at Notre Dame Stadium.
Fortuna Dusseldorf missed a penalty as Borussia Dortmund beat them 3-2 to keep their hopes of winning the Bundesliga alive.
Jadon Sancho caused Borussia Dortmund to be delayed on their way to London by forgetting his passport, and it could result in a punishment.
Teenage sensation Jadon Sancho settled the first Revierderby of the season with the winning goal in a 2-1 victory for Borussia Dortmund.
Schalke, Borussia Dortmund, Hoffenheim and Bayer Leverkusen won't make it easy but the trophy is tipped to stay with Bayern Munich.
Borussia Dortmund have won the race to sign coveted Werder Bremen midfielder Thomas Delaney.