Robert Kubica is still "a few more months" away from being able to return to Formula One, according to his doctor.

Kubica has missed the whole of 2011 following a rally accident in Italy in February which left him with life-threatening injuries. Having begun rehabilitation, Renault team principal Eric Boullier said that the team would keep a seat for Kubica if he was ready to return, but that he needed to be able to make a decision by mid-October.

While Renault has since pushed that deadline back, it appears Kubica will not be able to give the team confirmation any time soon, with Dr Riccardo Ceccarelli saying that progress is slow, even though he does still aim to be able to return.

"Our goal is to get him back in F1," Ceccarelli told Lucca television. "But he will still need a few more months of rehabilitation. The cuts were so bad that many colleagues and specialists had ruled out a return to the wheel for Robert. But, clinically, little by little everything has improved and the hope to see him driving as soon as 2012 is becoming more and more concrete."