Investors in Donington Park's circuit have been asked to sign up for a high-risk £135 million ($219m) bond in order to support the track that is aiming to host the British Grand Prix next year.
According to a document seen by the Reuters news agency, investor meetings for the seven-year bond began on Thursday.
Donington, under pressure to show its credentials to host the race, on Wednesday revealed its funding plans for the redevelopment of the circuit.
Reuters reports that rating agency Standard & Poor's (S&P) assigned Donington Holdings a CCC+ rating, seven notches below investment grade.
"The ratings on Donington reflect our view of the significant construction and marketing risks relating to the upgrade of Donington's racetrack and development of hospitality facilities," S&P analyst Silvia Ortolan told Reuters.