Ralf Schumacher may have driven a Formula One car for the last time after a disappointing test with Force India [ Images ] in Spain.

"I don't think I will be driving for Force India," the German told the Autosport web site (www.autosport.com). "I want to achieve something and I don't think I can do that with Force India.

"I am going home now and we will see."

Schumacher was quoted as saying in Sport Bild newspaper: "It's possible that today was my last drive in a Formula One car."

Schumacher, younger brother of retired seven times world champion Michael, was the slowest by a considerable margin of the 20 drivers on track in Thursday's test at the Jerez circuit.

By contrast, Austrian Christian Klien was seventh fastest and Italian Giancarlo Fisichella [ Images ] ninth for Force India in testing on Wednesday.

A team source said the 32-year-old German suffered a hydraulics failure in the morning, spun twice and never looked comfortable in the car.

Schumacher, winner of six Grands Prix with Williams from 2001 to 2003, left Toyota [ Images ] at the end of the season in October with his future uncertain.