Feb.15 (GMM) An unnamed formula one driver has expressed doubt that Williams is truly ready to return to the top of the timesheets.

Rubens Barrichello ended the recent Jerez test with the very quickest time, set at the wheel of the Oxfordshire based team's new FW33.

"I don't believe that time," a driver, who did not want to be named, told Germany's Auto Motor und Sport.

"If that's right then Williams are right up there this year," he added.

It is rumoured that Barrichello was at the time running with low fuel, super soft tyres and perhaps an underweight car after the KERS unit was removed.

Not even the Brazilian veteran said Williams is on top of the game.

"Red Bull are in front," he is quoted by O Estado de S.Paulo, "but the potential of this year's Williams is bigger than last season."

"Their speed is impressive," added Barrichello, referring to the Red Bulls that in 2011 will be driven by Sebastian Vettel and Mark Webber.

"Until the beginning of the season, many teams will get better, but so will they. I believe they will start the season ahead again," he said.

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