Warner, 26, copped a nasty whack into his hands when batting against firebrand paceman Mitchell Johnson in the WACA Ground nets in Perth on Wednesday.
The dashing left-hander was rushed to hospital for scans with team officials initially claiming the crisis management was only precautionary.
Results of x-rays revealed that Warner has a fracture in his left thumb.
The dashing opener is now even likely to miss the entire five-game series against the Windies.
Decisions on his immediate future and whether the star opener at all three levels of international cricket is able to take his place in Australia's squad for four Tests against India starting late next month.
Warner will miss at least Australia's first two matches against the Windies in Perth with no clear indication from team officials of how long he could be sidelined.
Warner has been replaced inj Australia's squad for Perth by Queensland right-hander Usman Khawaja.