The Williams team have confirmed their testing line-up for the opening pre-season test of 2015 at Jerez.
Valtteri Bottas, who finished fourth in the championship in 2014, will be in action for the first two days on Sunday and Monday, before handing over to Felipe Massa for the final two days on Tuesday and Wednesday.
The opening pre-season test will mark the first time the FW37 is seen in the flesh, after images were released last week to the public.
