The AT&T Williams team will debut its 2011 race car, the Williams Cosworth FW33, on day one of the Valencia test on Tuesday 1 February. Rubens Barrichello will undertake the first day and a half of testing duties, while Pastor Maldonado will take over on Wednesday afternoon for the remainder of the test.

The car will run with an interim livery so no roll out for photography purposes will take place. The team will announce an official launch of the FW33, complete with its new livery, at a later date.