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Paul di Resta believes his Force India team has "let things slip" in the last few races and needs to raise its game after the summer break.

Force India was among the strongest teams behind the frontrunners in the early part of the season, but failed to score a point in the last two races in Germany and Hungary.

That has allowed McLaren to close right up in the constructors' standings, with the British team now just two points behind in sixth position.

Both di Resta and team-mate Adrian Sutil were hit by hydraulic issues in the Hungarian Grand Prix last month.

The Scot admitted things have not been going as well as they should.

"I trust the team will have a lot of ideas as we go into the summer break," said di Resta.

"I think they have done a great job up until now, but we've let things slip slightly as a team in the last couple of grands prix.

"They're good guys and I believe they can work their way and come up with a solution."

The Force India driver is hopeful Force India will be stronger at Spa, which he expects to suit his car better.

"The track [the Hungaroring] didn't suit us; hopefully when we get to Spa with our lower downforce it will suit us," he added.

"We need to be doing a better job towards the end of the year and we'll try and do that as a unit."