While Valentino Rossi and Nicky Hayden were at the official MotoGP pre-season test in Sepang last week, the Ducati development team was on track at Jerez.

The progress of test rider Franco Battaini was overseen by Ducati Corse Director General Filippo Preziosi, who also remained in contact with the race team in Malaysia.

"We worked through an intense schedule with Franco, completing a series of software tests in close conjunction with the official team in Sepang," said Preziosi.

"Based on the feed-back from Valentino and Nicky, we carried the work forward on a parallel course which will allow us to provide concrete solutions for the next test in Qatar.

"We have also continued to work on the chassis set-up, gathering data which we will return to the factory with on Monday for comparison with that of Sepang."

Rossi admitted he was 'quite worried' after finished the Sepang test just eleventh fastest, +1.804sec from former Ducati rider Casey Stoner (Honda) and with a lap time matched exactly by team-mate Hayden.

"In Malaysia we have not finished in a position inline with our original target, but this was also due to some back luck," said Preziosi. "After a promising start to the test, Valentino became ill and lost a full day on the track, forcing him to cram all of the remaining work into the last day.

"Valentino, Nicky and all the guys at the track were working flat out, and we are doing the same back in the factory. We are confident that by going forward with this same level of commitment, and staying focused on our objectives we will realize the potential that we know we have."

Rossi complained of a lack of corner speed at Sepang, due to turning problems, while Hayden suffered a 'combination of little details'. The fastest Desmosedici was that of Aspar's Hector Barbera in tenth.

The third and final MotoGP pre-season test will be held at Qatar on March 13-14.