Since his skiing accident at the end of 2013, there has been speculation about Michael Schumacher's state of health for over six years. The family has released some information about this, but has never really gone into detail. That leaves room for rumours, this time about a new operation that the seven-time world champion may undergo.

Last September it was already known that Schumacher had been transferred to the Georges-Pompidou hospital in Paris for a 'secret' operation. There he would have received an experimental stem cell treatment. According to the Italian Contro Copertina, he now probaby get a second stem cell transplant.

This operation will be performed by the same doctor. Philippe Menasche is his name and he has previously stated that the purpose of the operation is to 'repair Michael's nervous system'. It is still unclear to what extent this was achieved during the first operation. The science behind this is still in its infancy.

"Over the past 20 years, science has made tremendous progress in stem cell treatment, but that doesn't change the fact that we still know little about the human brain. We are not able to say what results it will bring," said neurosurgeon Nicola Acciari, who says that Schumacher suffers from muscle atrophy and osteoporosis.

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'Schumacher will be in surgeory again' - GPblog