Michael Schumacher's management has felt compelled to issue another statement regarding the German's medical condition following further speculation in the media.

With rumours that the seven-time world champion may have lapsed into a 'natural coma' and be facing life in a permanent vegetative state should he ever emerge from it, Schumacher's representative, Sabine Kehm, has again asked for any report not coming from either his management or doctors to be ignored.

"I am stressing again that any statement regarding Michael's health not coming from the doctors treating him or from his management must be considered as speculation," the statement read, "I repeat that we will not comment any speculations."

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It is now a month since Schumacher suffered serious head injuries in a fall while skiing in the French resort of Meribel. Subsequent investigations have cleared suggestions that the German was travelling at excessive speed or had ventured too far of marked runs, but he remains in a medically-induced coma at Grenoble's university hospital.

Kehm's plea coincided with the release of another message from Ferrari, where Schuamcher claimed five of his world titles.

"Dear Michael, many years at Ferrari made you become one of us," wrote Piero Ferrari, "You've made a move many times, you gave us great joys but the biggest is yet to come see you again here in Maranello alongside your second family, the Ferrari ... See you there!"

Earlier, reigning world champion Sebastian Vettel had made his own comment on Schumacher's plight, admitting that his countryman - who started out as his idol before becoming a close friend - remained in his thoughts as pre-season testing began in Spain.

"He is still in a coma and we still don't know in what shape he will be when he wakes up, which is horrible for his family and close friends," the Red Bull driver told reporters at Jerez, "I pray and hope he will just come back and a miracle will happen and he will be the person he has always been before."