Nico Rosberg has said Mercedes now has a lot of work to do following a disappointing showing in the German Grand Prix.

Rosberg started the ninth round in the 2013 F1 World Championship from eleventh - after a mistake in qualifying meant he failed to progress to Q3. However if Saturday was frustrating, race day also turned out to be just as difficult.

Indeed while the 28-year-old did get points, finishing ninth at the chequered flag, he was not at all happy and pointed the finger at the revised rear tyres for the team's drop off in performance.

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"From the highs of recent weeks, we are rock bottom again, unfortunately," Rosberg said in his official post-race Video blog. "I thought those times were behind us, but we were straight back into them in the German Grand Prix. It really reminded me of those races earlier on in the year, like Bahrain and Barcelona, when we were just sliding everywhere and the tyres were overheating.

"It was very difficult. I was hoping to fight through the field from my poor qualifying... I thought I'd fly through. But I didn't have the pace. It was quite a long day.

"The last stint was finally a bit enjoyable. We put the option tyres on and had less fuel and I could push a bit there. The tyres also held on more with less fuel and I came through and managed some nice overtaking moves. That was okay. Two points is better than nothing at least. But it was more or less a weekend to forget.

"We have a lot of work ahead of us now. It is mainly, I think, just the change in tyres that has caused us to have trouble again. We need to re-analyse and re-think about it and make the most of these different tyres we have now, although again in Hungary it will be different. It is tricky times. But it is also an opportunity. We need to make the most of it. We have a three-week break now and it will be interesting to work with the team [and see what we can do before going to Budapest]."

Mercedes motorsport director Toto Wolff agreed that the event was a tough one and a real contrast to that seven days earlier in the UK: "We had a real character-building afternoon here at the Nurburgring. Neither of the drivers could find any grip on the prime tyre in the first part of the race and it mirrored similar experiences we have had so far this season," he added.

"After such a successful weekend in Silverstone, it feels a little bit like a night and day difference for us. We need to get our heads down at the factory, properly analyse our performance and keep working hard because we know that we will see similar temperatures in Hungary to what we experienced here."