McLaren boss Dennis was unimpressed with the idea
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Team bosses in Formula One have ruled out competing in a non-championship Grand Prix at Silverstone.
"It is simply not practical," said McLaren boss Ron Dennis.
Williams technical director Sam Michael added: "It's very expensive to go to a Grand Prix, so if it doesn't count for the championship why would you do it?"
Silverstone's owners are still battling to preserve their race on the calendar and have reopened negotiations with F1 boss Bernie Ecclestone.
On Saturday, Ecclestone had voiced his support to a non-championship race at Silverstone.
He said: "If they think a British race is so important, they should get on with it and put a race on.
He told The Times that as long the race was on a non-Grand Prix weekend, he would "help them in any way I can".
Ecclestone added: "They would have to take the financial risk but they would take all the income, which is what they want."