Peter Windsor has rubbished suggestions that USF1 is trying to terminate its contract with engine supplier Cosworth.
Reports in the German press mentioned the rumour last week, amid speculation the new American team's sporting director Windsor believes switching to Toyota power would be a better option.
However, it has also been suggested that USF1 is trying to cancel contracts in anticipation of failing to make it to the 2010 grid.
"The rumours are not true, I'm afraid," Windsor told the GPWeek magazine. "We are fully committed to Cosworth -- which is why we are delighted to have Bernard Ferguson working for us."
Until 2007, Ferguson was Cosworth's director of motor sport.
