Borussia Monchengladbach duo Filip Daems and Wesley Sonck will miss this weekend's Bundesliga start.
Daems is struggling with an Achilles tendon injury, whilst Sonck has a knee problem and both will be forced to watch Saturday's league opener against Energie Cottbus from the sidelines.
The news is a bitter blow to new Foals' boss Jupp Heynckes ahead of his first match in charge of the club after a nineteen-year break.
The former German international star lamented the absence of defender Daemsi in particular.
"He would have been an important man because I am not yet sure whether Marcell Jansen is fit enough to play the whole ninety minutes."