
"Whether it will be there or not is not yet definite," team boss Mario Theissen is quoted as saying by Germany's Sport Bild.
The Hinwil-based team has had a difficult start to the 2009 season, with hopes now pinned on a major upgrade for the struggling F1.09 in Barcelona.
The publication claims that designers did devise a double diffuser for the single seater, but that computer simulations raised doubts about its effectiveness.
The drivers, including Robert Kubica who is yet to score a single point, are not optimistic.
"We will make a step forward in Barcelona, but whether it will be big enough is improbable,” he said.
Team-mate Nick Heidfeld added: "We did the first four races without big changes on the car, while the other teams constantly had new parts and went further ahead than us."
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