The Stormers have lost JD Schickerling for four months and are sweating on the fitness of Cobus Wiese, Kobus van Dyk and Seabelo Senatla for this weekend.
Stormers flanks Wiese (shoulder) and Van Dyk (ankle) and wing Senatla (groin) will be given until Wednesday to prove their fitness to face the Highlanders in Dunedin on Friday.
Centre Dan du Plessis has recovered fully from a shoulder injury and will be available for selection to face the Blues at Newlands next week.
Lock JD Schickerling will undergo surgery on a torn pectoral muscle and has been ruled out for four months.
Hooker Bongi Mbonambi has had two abdominal surgeries as a result of appendicitis and will only be fit to train fully in three months.
Flyhalf Jean-Luc du Plessis (groin) has returned to full training and is expected to be fit for selection in the next few weeks.
Both Eben Etzebeth and Frans Malherbe are progressing well on their rehabilitation programmes and will continue to be assessed closely.