Michael Schumacher says he has fully healed from the neck injury he suffered in a motorcycle accident that precluded his Formula 1 comeback this year with Ferrari, and suggested a return to F1 could be on the cards next season. Schumacher made the comments in Brazil, where he competed in a charity karting race hosted by former Ferrari teammate Felipe Massa. Asked by reporters about rumors that he would come back with Mercedes Grand Prix, Schumacher replied: "Who knows? Anything can happen." He added, "I don't have any problems with my neck. It's 100 percent."