Sauber's mechanics have been forced to put in some extra hours following Giedo van der Garde's shunt at Silverstone last week.
Dutchman Van der Garde was behind the wheel of the C33 for the final day of testing on Wednesday, but he lost control at Copse and crashed into the barriers, causing plenty of damage to the car.
With the German Grand Prix taking place at Hockenheim this week, Sauber have some extra work on their hands.
"The race and the test at Silverstone have left their marks on the team," head of track engineering Giampaolo Dall'Ara said.
"On one side there are positive achievements in terms of overall progress, and on the other hand the amount of wreckage we brought back poses additional work we didn't need in the preparation for the German Grand Prix."
Van der Garde will be hoping for better luck when he steps back into the C33 in Germany on Friday as he has been handed FP1 driving duties.
"For me it will be the first time running in an F1 car in Hockenheim," he said.
"As the track is fairly close to Holland, I hope to see some Dutch flags around the circuit. I like this track. I have raced there quite a lot in Formula 3, and my last time in Hockenheim was in 2012 for GP2. I got Pole Position, so I am looking forward to going back and to drive there for the first time with the C33."
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