"We are continuing our negotiations with the BRDC (British Racing Drivers' Club), but we have the funding in place to go ahead at Donington Park if need be," newspapers quoted Kim Cockburn, managing director of Brand Synergy, as saying.
"Wherever the race is, we will have to build a new pits and paddock complex so it does not make any difference whether it is at Donington or Silverstone, but obviously Silverstone would be our choice."
Donington Park hosted the 1993 European Formula One Grand Prix and remains the venue for Britain's motorcycling grand prix.
However, other parties expressed lingering doubts about the race's future and the possibility of racing at Donington.
Traffic congestion at the circuit adjacent to the East Midlands airport is severe during the motorcycle race and the facilities are basic even when compared to much-criticised Silverstone.
Brand Synergy, backed by former world champion Nigel Mansell, said yesterday that they had agreed a deal with Formula One supremo Bernie Ecclestone to ensure the British Grand Prix remained on the calendar.
The calendar is due to be presented to the sport's governing body in Paris on Wednesday.
