Sergio Perez admits that he wasn’t feeling up to the job after the first session in Montreal today, leaving the team with no choice but to hurriedly put Pedro de la Rosa in the car.
“Of course I wanted to drive and I had no doubt I was alright,” said Perez. “But apparently this is unfortunately not the case. I am deeply disappointed. I spoke to the team after the session and told them that I’m not a hundred per cent fit. I only want to drive when I’m a hundred per cent well. I need some more time to recover.”
“This development hit us by surprise,” said Peter Sauber, “because Sergio underwent thorough medical checks, first in the hospital in Monaco, then in a hospital in Zürich, and finally, the FIA doctors gave him the green light this Thursday in Montreal. Nobody could have foreseen that he would feel unwell. Maybe we are being overly cautious, but when it’s about the health of our drivers we take zero risks.
“We want to thank Pedro de la Rosa and McLaren for helping us out in this situation.”
Adam Cooper F1 
To his credit he did not try to drive when he was not up to it and became a hazard to himself and others.
brave thing to do. Alex Wurz always laboured under a suspicion that he’d lost his nerve after his very similar monaco crash.
It can happen, I don’t think Ralph Schumacher was the same after his crash at Indy.
Or Massa after Barrichello’s debris clubbed him at Hungary. He clearly hasn’t had the same aggression since then.