Meanwhile, the driver took to Twitter to assure fans that he "will do whatever it takes to get to the bottom of this and get back out there no matter what." Previously, Allmendinger had tested positive for a stimulant back in June and was temporarily suspended on July 7, but denies knowingly taking any banned substances.
At this juncture, Allmendinger will only be reinstated as a driver once he completes a "Road to Recovery" program. NASCAR will issue a letter on that program, and the driver will have to agree to those terms in order to take part.
In the interim, Sam Hornish, Jr. will take Allmendinger's seat at Indianapolis for the next race.