USA midfielder Gio Reyna did not show much hustle in training and coach Gregg Berhalter was close to sending him back.
USA finished third behind Canada and Mexico in World Cup qualifying and now face a must-win final group-stage match.
Borussia Dortmund are second in German Bundesliga points table with 53 points from 25 matches. Bayern Munich lead the table with 60 from 26.
