Sebastian Vettel is the latest of several Formula One drivers past and present to wish Michael Schumacher well after the racing legend was involved in a serious ski accident on Sunday.
Vettel, the four-time World Drivers' Champion, idolized Schumacher as a boy and learnt racing at the Kerpen track that became famous for being the scene of the 44-year-old's first karting successes.
"I am shocked and I hope that he gets better as quickly as possible," Vettel said on Monday.
"I wish his family much strength."
Schumacher's team-mate at Benneton in 1992 and 1993 said the news of his accident reminded him of Ayrton Senna's fatal crash at Imola in 1994.
"When I read that Michael had received a blow to the right side of his head I couldn't help but think of Ayrton, and pondered why these things so often happen to the truly great," Brundle said.
"I sincerely hope and expect of course that this incident has a much happier ending [than Senna's accident], and I feel sure that his competitive determination and fitness will give him the best chance.
"I sincerely hope and expect of course that this incident has a much happier ending [than Senna's accident], and I feel sure that his competitive determination and fitness will give him the best chance."
"Michael loves to challenge race tracks on superbikes and he often excitedly shows his many amazing a driven and competitive person you can't simply switch off and settle down at the end of a long skydiving pictures on his phone.
He's only a year out of the F1 cockpit but as career, you need challenges and achievements to keep the adrenalin flowing. But from what I read he wasn't taking undue risks, and it seems he's been very unlucky."
Ross Brawn, who played a key role in all seven of Schumacher's Drivers' Championship titles, was among the visitors at the Grenoble University Hospital Centre where he is currently in a medically induced coma.
Jenson Button and Lewis Hamilton both took to Twitter to publicise their support, while Eddie Jordan told the BBC that he was confident that Schumacher would be able to pull through.
"If you were going to look for someone to take on the fight, whether it be sporting or in life, Michael is someone you want on your team," Jordan said.
"He's resilient, he's a very tough guy, so much so that people didn't always warm to him, but that was his persona and he brought a new level of professionalism to Formula One, certainly in terms of fitness."