Jantjies back for Bulls' season finale
Jantjies injured his rib against the Sharks two weeks ago.
Nyakane injured his wrist while representing South Africa A against the French Barbarians in June.
There is also a possibility that Springbok flyhalf Handré Pollard could play this week.
Pollard, who has been struggling with an ankle injury since last year and withdrew from the SA A team in June, will consult a specialist on Tuesday.
A decision on his availability will be made later this week, according to team doctor Herman Rossouw.
Springbok lock Lodewyk de Jager remain sidelined with a back injury he sustained while on Bok duty in June.
The Bulls will name their team - to face the Stormers - only on Thursday.