Robert Kubica has split with his rehabilitation doctor Riccardo Ceccarelli, according to reports in the Italian and Polish media.
The reports said the parties disagreed over the final phase of the Polish driver's recovery from horror injuries sustained early this year whilst rallying.
"I can confirm that there were differing views as to the next phase of rehabilitation," Ceccarelli confirmed.
"Robert will continue with this process under the direction of someone else. Who it will be, I don't know."
Dr Ceccarelli said he stands by his earlier prediction that Kubica could be fit enough to return in 2012.
"I've always said that and I stand by it, even though expectations that he could be back in a Renault in November were probably somewhat exaggerated."
Also according to Omnicorse, Ceccarelli said he doesn't know if Kubica's management has been in talks with Ferrari.