Formula One drivers Lewis Hamilton and Jenson Button are among the sports stars who have sent handwritten messages of support to critically injured Michael Schumacher while he is recovering from a serious head injury. Retired driver Schumacher was hurt while skiing in the French Alps in December (13). He woke from a coma in June (14) and is now receiving rehabilitation treatment in Switzerland. His fellow Formula One racers have now sent him moving handwritten notes of support. A letter from Lewis Hamilton, obtained by Britain's Daily Mirror newspaper, reads, "You are always in my prayers. May God show you the way back to your family, fans and friends." Button wrote, "He's fighting his greatest battle and I know everyone at Formula One will hope that he will win again." Schumacher has also received messages from former Formula One driver Niki Lauda, German soccer player Lukas Podolski and former tennis ace Boris Becker. Schumacher is reportedly using his eyes to communicate and doctors hope he will soon be able to use a wheelchair which can be controlled by his mouth.