Robert Kubica's manager has revealed that surgeons are still battling to restore functionality to the Renault driver's right hand.
Kubica, who was taking part in the Rally Ronde di Andora in Italy on Sunday morning, lost control of his Skoda Fabia.
The car left the road at high speed and crashed into a wall of a church with the driver's side also sustaining impact from a guardrail.
Kubica had to be cut from the car and was airlifted to Santa Corona hospital.
His Lotus Renault GP team confirmed that Kubica suffered "multiple fractures to his right arm, leg and hand" in the incident, and he has undergone surgery this afternoon.
Although there were fears that the Renault driver would lose his right hand, his manager Daniele Morelli revealed that is not the case.
However, it remains to be seen whether Kubica will recover complete functionality.
"Unfortunately the impact with the guardrail caused serious harm," Morelli told reporters outside the hospital.
"He has been diagnosed with multiple fractures to his leg and right arm, especially complications related to his right hand. We shall see later if the operation was successful.
"The clinical picture is not easy. We expect to make the necessary assessments tonight.
"The surgeons are trying to restore the functionality of his right hand. We must now think about the muscle function, but Robert is very strong and will succeed.
"The important thing is that Robert recoveries, as it has already proven to do with the incident in Canada. On that occasion it took him three months to get back on track."
Kubica sustained 'multiple fractures'