Peter Sauber has admitted he feels sorry for departing technical director Willy Rampf after the teams disappointing showing in the Malaysian Grand Prix.

The race marked Rampf's final race with the team before his departure, with former Force India technical chief James Key having come in as his replacement.

The Sepang race saw Pedro de la Rosa retire before even making it to the grid with an engine issue, while Kamui Kobayashi was also forced to retire in the early stages of the race with an engine problem.

Ferrari has confirmed that the problems were linked to a malfunction of the electronic engine management but Sauber said felt sorry that Rampf's time with the team had come to an end in such fashion.

"I feel sorry for Willy Rampf," he was quoted by the Swiss 'paper Blick. "For nearly 15 years he was our technical boss, and at our very last race he has to live through such a debacle.

"Until the last day he fought for our team, and I know how much these losses affect him, even if he cannot do anything about it."

Sauber is the only team aside from the three newcomers to have failed to score this season, with the team boss admitting he 'didn't count on it being quite so hard'.