Holtby (lower body) won't make the trip for Thursday's game in Minnesota and isn't expected to be available for Saturday's game versus St. Louis, Bruce LeVine of Dallas Stars Radio reports.
Holtby's injury was originally believed to be minor, but at this point it's become clear he's likely dealing with something a bit more serious. Anton Khudobin and Jake Oettinger will continue to serve as Dallas' top two netminders until Holtby is ready to return.