Ferrari team principal Stefano Domenicali has admitted the Scuderia is at a loss to explain why it struggled so much in Germany and Hungary.

The Maranello-based team began the F1 2013 season strongly with Fernando Alonso winning in China and Spain.

However the last few races have been a bit of a struggle, with Alonso now falling back to third in the Drivers' Championship, while Ferrari has also slipped to P3 in the Constructors', 14 points behind Mercedes and 83 points behind the leaders, Red Bull Racing.

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The drop-off has coincided with changes to the Pirelli tyres, made after all the failures at the British GP, but Domenicali conceded that it not clear if this is the main reason for the teams' woes.

"I don't know for sure what exactly is the problem," Domenicali told The Press Association. "It appears we have apparently lost the gap we had at the first few races when our race pace was strong.

"But now we are not where we want to be, so we need to understand if this [the tyres] is the case [hurting us] and how to react.

"It's something we need to analyse carefully because the structure of the tyres now is what we have until the end of the season.

"It seems, for example, Mercedes have solved the issue because they were suffering massively during a race."

Domenicali also added that some of the updates made to the F138 haven't been as effective as they had hoped.

"We have improved the car for qualifying but not for the race," he continued.

Despite that though, he is optimistic there will be a 'reaction' and step forward for the Belgian Grand Prix later this month.

"We have done a programme to be ready for Spa and hopefully we are able to manage it," he stated.

"But there is no reason to be feeling any negative pressure. I am expecting a reaction from my technical group and this is what matters."