Michael Schumacher with Willi Weber

Willi Webber, who helped guide Schumacher to seven F1 titles during a 20-year partnership, said he was no longer on contact with his protege.

He said: “The Schumacher family seems to be afraid of me. I sent the family flowers and cards for his birthday but I got no answer. That makes me sad.

“There seems to be the fear that I would disclose something about Michael’s condition but I would never do that. I would even sign a non-disclosure agreement.”

Michael Schumacher

The 74-year-old said he felt the Schumachers should be more honest with fans about the former Ferrari hero’s recovery from catastrophic head injuries sustained in a ski accident in late 2013.

He said: “I think they should explain to his millions of fans how he is doing.

“For some time now I’ve been saying that the Schumacher family is not telling the whole truth.

“But I’m biting on granite because for a long time my advice is no longer heard.”

Michael Schumacher's homeGETTY

Michael Schumacher’s home in Switzerland where he has been cared for since 2014

Schumacher collected world titles with the Benneton and Ferrari racing teams between 1994 and 2004 under Mr Weber’s guidance.

And the former manager is optimistic that the 47-year0old German will one day recover.

He said: “When I’m home alone and the phone rings I often feel that it will be Michael saying ‘Willi, how’s it going?’ Hope dies last.”

Schumacher’s accident happened on a family holiday as he was skiing with his son at the Meribel ski resort in the French Alps.

Michael SchumacherGETTY

Michael Schumacher has not been seen in public since his 2013 ski accident