Training is suspended after the squad was quarantined Wednesday with Hoffenheim due to host Stuttgart in their next German league game on 21 November.
Liverpool face Spanish side Sevilla on Sunday at Boston's Fenway Park baseball stadium in the second game of their three-match US tour.
Bundesliga: Borussia Dortmund stars criticized by bosses for inviting barber to team hotel ahead of Champions League match
Dortmund's professionalism was criticised in the German media before the team even flew from Dortmund after their plane was delayed because Jadon Sancho and Diallo forgot their passports and Omer Toprak lost his boarding pass
Bundesliga: Borussia Dortmund enter busy spell of fixtures on course to become German 'autumn champions'
The unofficial title Dortmund could win carries neither a trophy nor prize money, but 38 of the last 55 Herbstmeisters went on to become German champions
Bundesliga: Teenager Achraf Hakimi scores on debut as Borussia Dortmund thrash Nuremberg 7-0; RB Leipzig beat Stuttgart
Teenager Achraf Hakimi scored on debut as Borussia Dortmund waltzed to a 7-0 win over Nuremberg on Wednesday to keep the heat on Bundesliga leaders Bayern Munich
Alcacer, who joined Dortmund from Barcelona in the offseason, fired a shot to the top left corner in the 88th minute after a set up by substitute Jadon Sancho. Alcacer had earlier helped Dortmund reclaim the lead.