Peter Sauber on Sunday said he is "very optimistic" Sergio Perez will be in action this weekend in Canada.
The Mexican rookie spent two nights in a Monaco hospital with concussion and a bruised thigh after his high speed qualifying crash.
He must be cleared by FIA doctors before getting the green light to race this weekend.
But team boss Sauber wrote in the Swiss Sonntagsblick newspaper that, after the 21-year-old's hospital stay and some further rest days in the Principality, Perez was at the weekend examined in a speciality clinic in Zurich.
"The results were positive, so we are very optimistic that he will be at the start in Canada," he said.
Sauber revealed that the FIA doctors will examine Perez on the Thursday before the Canadian Grand Prix in Montreal.