Senna, meanwhile, has already been 'confirmed' at Williams
by one if his sponsors - a claim denounced by both driver and team - but could still wind up filling the third driver role at Enstone if he fails to land a race seat.
Sutil and Barrichello continue to try and amass the financial backing needed to partner Pastor Maldonado
at Williams, although the team is thought to look dimly on the German's apparent interest in replacing Felipe Massa
in 2013. A similar far-reaching focus almost cost Sutil his ride at Force India
for 2011, and could result in the German missing out altogether this year.
The remaining candidate for the vacant HRT seat, meanwhile, is understood to be former pilot Narain Karthikeyan, who is currently building support from his native India in a bid to return to the cockpit he vacated for Daniel Ricciardo midway through 2011.