The Lions medical staff have released an injury update, following Sunday's 41-13 loss to the Waratahs in Sydney.
Unfortunately utility backs Lionel Mapoe (Knee), Courtnall Skosan (Hamstring) and forward Derick Minnie (concussion) have returned to South Africa on Monday.
They will undergo further scans and tests upon their arrival.
Coenie van Wyk and Alwyn Hollenbach will depart for Perth this evening in order to provide cover.
The Johannesburg-based franchise face the Western Force in Perth on Saturday.