Marussia has issued an update on the condition of Jules Bianchi, saying he remains in a "critical but stable condition" as "the situation remains challenging".

Bianchi has been in hospital in Japan since he crashed in to the back of a recovery tractor during the Japanese Grand Prix nine days ago. With Bianchi's father - Philippe - saying the "situation is desperate", an update from Marussia confirms Bianchi's condition remains unchanged.

The full statement reads as follows:

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"The past nine days have been extremely difficult for Jules and his family. As a consequence of the accident at Suzuka, a number of medical challenges have needed to be overcome and the situation remains challenging due to the diffuse axonal traumatic brain injury Jules has sustained.

"Jules remains in a critical but stable condition in the Intensive Care Unit of Mie General Medical Center in Yokkaichi. The Bianchi family continue to be comforted by the thoughts and prayers of Jules' many fans and the motor sport community. In particular, the many demonstrations of support and affection during the course of the Russian Grand Prix in Sochi were of enormous comfort to Jules' parents and the relatives and friends also present at the hospital.

"The family will provide further medical updates when appropriate."