Nico Hulkenberg will not return to Abu Dhabi later this week for the Pirelli tyre test.
The 23-year-old German said at the Yas Marina circuit at the weekend that he and 2010 teammate Rubens Barrichello will be sharing the FW32 for the two-day Pirelli tyre test on Friday and Saturday.
But on Monday, the British team announced that only Barrichello has been re-signed to race in 2011.
That news has affected Williams' Pirelli test schedule, a spokesman confirmed on Tuesday.
"Rubens will now drive both days," he said.