There was mixed news for the Stormers on Monday as Schalk Burger returns to fitness but Demetri Catrakilis has been sidelined.
Along with Pat Cilliers, Catrakilis will miss this weekend's Super Rugby action, where the Stormers travel to Bloemfontein to take on the Cheetahs, who they leapfrogged in the overall standings thanks to Saturday's 18-3 win over the Lions.
Oliver Kebble is also set to return after he and Burger missed the victory, but the loss of Cilliers and Catrakilis is a blow for the Cape side.
The fly-half has suffered a broke nose likely to restrict his involvement on matchdays for two weeks while Cilliers saw a knee specialist on Monday. If his injury - a meniscus tear - requires surgery, he may miss five to six weeks of rugby.
Frans Malherbe and Sailosi Tagicakibau sat out training on Monday, whilst senior men Duane Vermeulen and Jean de Villiers did their flush-out in the morning and sat out the afternoon session.
Prop Malherbe, who was sick in bed at home, Vermeulen and de Villiers are not in any doubt for the Cheetahs clash.
Hooker Scarra Ntubeni (calf muscle) and wingers Kobus van Wyk (abductor muscle) and Cheslin Kolbe (knee) will be given one more training session to prove their fitness but head coach Allister Coetzee is "positive about all three players".
"There are a few positives (injury-wise), but - as a coach - you're never happy with your injury list, you always want it to be as short as possible. Injuries are always challenging, but it's part of the game and you need to make your plans accordingly," said Coetzee.
"After reviewing the Lions game again this weekend, it was an encouraging performance. We know we've not achieved anything as yet, but we're constantly striving to look better.
"We spoke about our discipline against the Lions, we know it wasn't good, but we were not happy with our work at the breakdown - also looking at our body position and how we carried the ball into contact."