Global Motorsport Media
The teams alliance FOTA looks set to dwindle to just seven members, as Sauber confirms it is pulling out amid speculation Toro Rosso will shortly follow.
International media reports quoted official spokespeople for Swiss based team Sauber as confirming that notice has been given to FOTA chairman Martin Whitmarsh.
"The reasons were communicated to the teams of the association, but they will not be made public," Germany's Sport1 reported, citing a team official.
"Toro Rosso has not yet announced its departure, but in practice it is certain," wrote Finland's Turun Sanomat newspaper.