Schumacher is now communicating with his family by fluttering his eyelashes, according to reports, and the latest developments has led to suggestions that he could be allowed home next month.
The seven-time Formula One champion is still in a critical condition in the Swiss clinic he moved to last month but the latest developments has increased hope that Schumacher could make a recovery.
And now the personal and touching letters written by Hamilton and Button have been released for the public to read.
Hamilton's letter read:
"Dear Michael. You are always in my prayers. Prayers of hope that you pull through this difficult time.
"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."
Button’s letter read:
"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. 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.
"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."
F1 legend Niki Lauda also wrote Schumacher a heartfelt letter.
"Michael, every day I follow the news on your progress and every day I am close to you. I hope I will be able to talk to you very, very soon."
The publication of the letters comes after Schumacher's wife, Corinna, recently thanked fans for all their support in a letter published in the Grand Prix programme:
"The German Grand Prix gives me the perfect opportunity to cordially thank you for all your good wishes and positive energies you keep sending Michael," she wrote.
"I have to say your sympathy blew us all away! Good to know that together we made it through the hardest time!”
- Michael Schumacher
- Lewis Hamilton
- Jenson Button