Williams questioned Red Bull and Ferrari sidepod design

Williams' concerns about some rival cars' possible infringement of the 2009 rules is likely to be cleared up on Thursday.

In Australia late last month, in the middle of the 'diffuser' saga, the British team lodged but ultimately dropped a protest against the Red Bull and Ferrari teams.

It is believed the protest - a rare action for Williams - related to concerns about the sidepod aerodynamics of the respective cars.

The Grove-based team said it withdrew its protest ‘in the interests of the sport’, and Technical Director Sam Michael said he trusted the FIA to handle the problem.

Motorsport Aktuell reports that the Technical Working Group, comprised of top technical boffins of the F1 teams, is meeting on Thursday where the matter will be discussed.

The Swiss publication said Williams could have dropped the protest also because it was discovered that half of the cars on the grid fall foul of their concerns.