BVB right-back Thomas Meunier and goalkeeper Gregor Kobel sustained injuries during the friendly against Manchester United (3-2) in Las Vegas on Sunday evening.
Meunier sustained a serious muscle injury in a sprint and will unfortunately be unavailable to BVB for several weeks.
Kobel will have to sit out training this week due to a minor injury.
Nico Schlotterbeck had earlier sustained an injury in the match against San Diego Loyal (6-0) last week and departed prematurely from the USA in order to undergo an examination in Germany. The high-resolution images ultimately gave the all-clear. Due to a minor injury, however, Schlotterbeck will also not train this week.