Christian Horner fears that his Red Bull team may struggle in the next two races of the season after the summer break.

Team principal Horner is aware that the races at Spa and Monza have long straights and Red Bull have been at their best so far this year on tight tracks at which high levels of downforce are required.

Mark Webber has already said that his team "don't have the most powerful engine" and, speaking to Auto Motor und Sport, Horner agreed with that assumption.

He said: "In the windy sector two we must make up time.

"On the hill down to Eau Rouge and the long straight to the finish we will lose time again."

Red Bull have been the dominant team so far this year with Webber leading the drivers' title race while team-mate Sebastian Vettel is also well placed although he has tended to save his best performances for qualifying.

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