Renault's Vitaly Petrov has been given a five-place grid penalty ahead of Sunday's F1 2010 Italian Grand Prix at Monza.

The Russian was reprimanded after the stewards ruled that he had impeded Virgin Racing's Timo Glock during Q1 today. Petrov, who had qualified 15th in Q2 - his best lap a 1 minute 23.819 seconds, will now drop to 20th.

"It was a tough qualifying session this afternoon with very small gaps between the cars around the top ten," said Petrov, "and I can only apologise to Timo if I held him up. I didn't see him coming up behind me and didn't see any blue flags as I came out of the pits.

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"My grid penalty will make things even harder in the race. But, as we saw in Spa, tomorrow is another day and a lot can still happen."

Renault chief race engineer, Alan Permane meanwhile revealed that Petrov has been plagued by brake problems this weekend.

"Vitaly lost running time both yesterday and this morning with brake problems, which also recurred in a different form during qualifying," Permane confirmed. "This has made it even more difficult for him to get to grips with the car in low downforce trim.

"He obviously has a difficult afternoon ahead of him tomorrow, compounded by his five-place grid penalty, and we will try and get him as close to the points as possible," he added.