2003 World Rally champion Petter Solberg has also expressed an interest in entering the IndyCar finale and try to win the $5 million bonus.
Series chief Randy Bernard is thought to be interested in getting a rally driver to compete, and Solberg told AUTOSPORT that he would love to have a go.
"I always wanted to try something like this," said the Norwegian. "Competing at an event like this would be good fun.
"I have tested a Le Mans car and a Formula 1 car, so I don't think the driving challenge would be a problem for me."