The Williams team says it will not find out until Sunday if Valtteri Bottas will be able to race in the Australian Grand Prix.
Bottas was taken to the medical centre and then to hospital after complaining of back pains following the end of qualifying, in which he finished in sixth position.
Head of vehicle performance Rob Smedley said Bottas will not stay in hospital overnight, but the team will not know if he can race until tomorrow morning.
"He felt some pain under braking at the end of his second attempt in qualifying two. Then it kind of escalated from there through the third qualifying," said Smedley.
"The update will be tomorrow. He's going back to his hotel and he's going to rest. He's not being kept in overnight.
"He'll come back in and he'll be checked over tomorrow."
When asked if Bottas will be able to race, he said: "It's not for me to say, to be honest. That's for the medical people to say.
"He has to go through the checks this evening and tomorrow, and time will tell."