The Williams Formula One team will present their 2005 driver lineup in Bahrain on January 7, the team said on Monday.
Next season's BMW-powered FW27 car will be launched at Spain's Valencia circuit on January 31.
Williams have already signed Australian Mark Webber, who will have his first outing with the 2004 championship fourth-placed team at Barcelona's Circuit de Catalunya on Tuesday after leaving Jaguar.
The team, who won the last race of the year with Colombian Juan Pablo Montoya in Brazil, will also be testing Britain's Anthony Davidson and Germany's Nick Heidfeld over the coming weeks as they seek to fill the vacant second seat.
Brazilian Antonio Pizzonia, the team's test driver who competed in four grands prix this year as a stand-in for injured Ralf Schumacher, is considered the frontrunner for the most competitive drive still available.
Ralf Schumacher and Montoya have left Williams for Toyota and McLaren respectively while Spanish test driver Marc Gene has moved to Ferrari.
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