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Critically injured F1 star Michael Schumacher has reportedly shown further signs of improvement after leaving a medically-induced coma in mid-June, following his skiing accident in December. The former Ferrari driver is reported to have now started fluttering his eyelids to communicate.

British racing drivers Lewis Hamilton and Jenson Button have since written handwritten letters of support to Schumacher. Hamilton's letter reads: "Dear Michael, You are always in my prayers. Prayers of hope that you pull through this difficult time", writes the Mirror.

Hamilton continues, "You have already achieved so much, given so much. May God watch over you and show you the way back to your family, fans and friends."

The letter from Button reads: "When I think of Michael Schumacher I think of two things. The first is of one my earliest memories of being in Formula One driving out of the pitlane in Melbourne and seeing Michael's red Ferrari ahead of me scattering the leaves as he drove beneath the trees at the approach to turn three."

Button goes on to say, "Even in 2000 he was already a legend. The second thing I think about it is that familiar red car snaking about in my mirrors. Michael was such a formidable racer, relentlessly competitive - Always There."

This poignant letter continues, "He's fighting his greatest battle right now and I know everyone at Formula One will hope that he will win again. I certainly hope he will."

Thanks to his progress the former racing driver may be allowed to return home by the end of August, reports a Swiss newspaper. He is expected to still require 24-hour care though, as he fights to overcome injuries sustained in a skiing accident in the French Alps last winter.

Doctors at the Swiss clinic hope to move Schumacher into a sophisticated electronic wheelchair within weeks. His wife, Corinna is claimed to have transformed part of their home into a medical centre and has had a new building with no outside steps constructed in the grounds of the house.

Schumacher has also received tributes from racing star Niki Lauda and German tennis player Boris Becker among others. It is believed that though still paralysed, he is able to answer questions from family by fluttering his eyes, reports the Mirror.