Jenson Button fears McLaren will struggle in the German Grand Prix despite strong one-lap pace during Friday practice.

Button was seventh quickest during FP2 with team-mate Kevin Magnussen ahead of him in fifth place as McLaren showed encouraging pace on the supersoft tyre. However, Button was more concerned about the performance of the car on high fuel and believes the weekend is likely to be a tough one for the team.

"It's tricky so we've just got to make the best out of what we've got," Button said. "Our long runs are not looking that special here. There are a lot of cars that are quicker than us, very different to Silverstone so I don't know why that is. I think we're overheating the tyres quite a bit on traction."

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Button admitted he was surprised to be so high up on the timesheets in FP2, but said there was a chance he could find an improvement when he tests a new rear wing on Saturday.

"Not looking at the times I would say we're finding it tough out there really. It's so difficult in this temperature, especially with the supersoft tyre we're finding it difficult to get it working correctly and not overheat it.

"Lots of interesting things tested today and I've got something coming for my car tomorrow which I didn't have today [rear wing] ... Yeah, I'll get it tomorrow. The problem is a few laps on Saturday morning it's always difficult to see. You don't know when you're testing on Friday what it's going to give you on Saturday, so hopefully it will just be positive."

Asked if Pirelli had been too aggressive with its tyre choices of supersoft and soft for Hockenheim, Button defended the tyre manufacturer saying there was little it could have done differently.

"Yeah but when they made the decision to bring the tyres I don't think they expected it to be so hot here this weekend. It's a very difficult call. There are only four different tyres that they can use so it's tricky, but it's going to be tough tomorrow."