Cape Town - Springbok captain Siya Kolisi is set to make a return from injury sooner than expected.
Following that, Erasmus is hoping the forward can get two Test matches under his belt before the Rugby World Cup starts in Japan.
"He could run out for Western Province in two weeks' time, and then we'd be confident to get him back for the last two Tests before we fly out to Japan."
Substitutes: 16 Schalk Brits, 17 Lizo Gqoboka, 18 Vincent Koch, 19 Marvin Orie, 20 Marcell Coetzee, 21 Cobus Reinach, 22 Frans Steyn, 23 Dillyn Leyds
Substitutes: 16 Jordan Uelese, 17 Harry Johnson-Holmes, 18 Taniela Tupou, 19 Rob Simmons, 20 Jack Dempsey, 21 Will Genia, 22 Matt To'omua, 23 Kurtley Beale