McLaren's Lewis Hamilton has been stripped of his best lap in Q3 after it was found he cut the chicane.
The stewards have subsequently deleted the time and the Englishman will now start the F1 2011 Monaco Grand Prix from ninth, as Sergio Perez is not expected to be able to race following his violent crash.
to news of the punishment, Hamilton conceded it was a mistake to opt for only one-run in the top-ten shoot-out.
“After the restart in Q3, I had no temperature in my tyres or my brakes, so I didn't manage to pull a great lap together. With hindsight, we probably should have put a banker in,” he confirmed.
“I felt I'd been driving well all weekend and I had the pace to be on pole – I'm certain of that, in fact.
“I'll do my best from my grid slot – and, while it'll be tough to win from there, I won't give up. I'll keep pushing. My job will be to get as many points as I can tomorrow.”
McLaren boss, Martin Whitmarsh meanwhile was similarly frustrated not to see Hamilton end qualifying higher up, especially as the Brit had been fastest in Q1 and Q2.
“He's understandably disappointed, because he's been in fantastic form all weekend and was looking very good in Q1 and Q2 today,” Whitmarsh continued. “It's fair to say that he fancied his chances of bagging pole position today.
“Instead, he'll start from P9 – which, on the tight confines of this notoriously tortuous circuit, presents quite a challenge in terms of recovering from a disappointing qualifying position.
“But he loves this circuit – and, if there's one man who's capable of making that recovery, it's Lewis.”