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Team boss Maurizio Arrivabene has warned that Ferrari may struggle this weekend at Silverstone.
Thanks to Mercedes' double failure, Sebastian Vettel left Austria on Sunday with a 1 point lead in the world championship.
'It looks quite difficult'
But as Formula 1's first ever triple header ends in Britain this weekend, Ferrari's Arrivabene is not sure Vettel can keep the lead.
READ: Ferrari working to 'unbalance' championship - boss
"On paper, Silverstone looks quite difficult for us. Aerodynamics are very important and it will be a difficult race for us, so we have to stay focused," Arrivabene told Sky Italia.
But he says a question mark about reliability at least now hangs over Mercedes, even though the German team was bullish about its big upgrade package in Austria.
"Sometimes you speak too loudly. In F1 you can bring an interesting upgrade package but maybe it gets too warm and you stop," said the Italian.
'They both fought'
Arrivabene also defended Ferrari's decision not to use 'team orders' in Austria, even though moving Kimi Raikkonen aside would have given Vettel a bigger points lead.
"We decided to let Kimi, who is a world champion, drive. They both fought the whole race," he said.
Vettel would have preferred to have done better simply by starting higher on the grid, but he was penalised three grid places for blocking Carlos Sainz in qualifying.
"Oh, I could talk about it for a long time. Even Sainz said it was nothing. Ok some complained, but complaining is not motor racing. We should let the drivers sort it out between us," the German driver said.
Vettel also said he was happy that Ferrari didn't issue team orders last Sunday.
"No, why?" he said when asked if he wanted Raikkonen to move.
Kimi drove as fast as he could and so did I. Without the three lost (grid) places, we could have won.
Our race speed is right, but in qualifying we are currently a bit behind. So we need to roll up our sleeves.
At Silverstone, we are not usually the best, so Mercedes is the favourite there I think," Vettel added.