It has been uncertain whether he would keep his seat for the next race in Melbourne, with Sainz stunning many inside the paddock after walking around the Saudi paddock just hours after his surgery was completed.
Ferrari chief Frederic Vasseur though admits he already has a contingency plan in place after revealing Bearman will once again be on standby if Sainz is not fit enough to compete at Albert Park.
"I'm not a doctor, but we have to take this step by step now", he told Sky Sports Germany after the Saudi Arabian Grand Prix.
"He has to recover first. We'll make a decision next week. We'll have Oli with us again in Melbourne, just in case, but we're optimistic that Carlos will be there again then."
Ferrari have started the season as chief challengers to Red Bull, but are a long way behind their rivals in terms of pace despite third-place finishes for Sainz in Bahrain and Charles Leclerc in Saudi Arabia.
Following two Saturday races to open the season, F1 will return to its traditional Sunday raceday slot in Australia.