"I wouldn't feel comfortable sitting at home and watching someone else driving my car," said Barrichello, who acknowledged he has "no idea" how to set up a car on an oval.
Former driver and team owner Michael Andretti expects the ovals to be a challenge to Barrichello, but is confident the Brazilian will enjoy his move to IndyCar.
"He's done it all in Formula One but he's going to have new challenges for himself and I think he's really going to enjoy that with these ovals," Andretti said. "Because he's going to find out that it's not that easy."
AP Auto Racing Writer Jenna Fryer contributed to this report from Charlotte, North Carolina, and AP Sports Writer Chris Jenkins contributed from Milwaukee, Wisconsin.
Follow Tales Azzoni at http://twitter.com/tazzoni
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.