Read the full story here: US F1 team on verge of collapse.

BBC: Thursday's F1 testing in Barcelona as it happened

Currently only five teams have committed to racing in next season's championship: Williams and Force India, who were expelled from FOTA for agreeing to participate, and new teams Campos GP, Manor F1 and Team US F1.

CNN: Formula One chief 'unconcerned' by rift

So we asked our friends at the Sauber F1 Team to help us out.

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Windsor, who is US F1's co-owner with former Ligier technical director Ken Anderson, insisted his team were also on track.

BBC: US F1 and Campos deny Bernie Ecclestone's 2010 doubts