"He is getting better but everything is relative. It's very difficult. He can't speak. Like me, he is in a wheelchair paralysed.
He has memory problems and speech problems," Streiff, a good friend of Schumacher, was quoted as saying by the Daily Mail.
Streiff is himself wheelchair-bound after suffering a crash in Brazil during pre-season tests in 1989. The 45-year-old Schumacher suffered a ski accident in the French Alps December 29 last year, which left him brain damaged and fighting for his life.
The seven-time champion was transferred to Lausanne Hospital, Switzerland, in June this year and he is now being cared for at his home on the shores of Lake Geneva.