NASCAR received notification on Saturday afternoon that A.J. Allmendinger, driver of the No. 22 Penske Racing Dodge, has tested positive for a NASCAR-banned substance.

As a result, he has been temporarily suspended. Allmendinger provided two samples, with only "Sample A" being tested. He has 72 hours to request that "Sample B" be tested. NASCAR will take further action from there. If Allmendinger does not request to have the "B" sample tested or if the "B" sample comes back positive, Allmendinger will be suspended indefinitely by NASCAR.

"NASCAR notified Penske Racing this afternoon that AJ Allmendinger was administered a drug test earlier this week, and those results tested positive. NASCAR has a strict drug testing program that Penske Racing fully supports. Penske Racing will work with NASCAR through this process and its next steps. Sam Hornish Jr., will drive the No. 22 car in tonight's Coke Zero 400," a statement from Penske Racing said.

Penske Nationwide Series driver Sam Hornish Jr. was flown to Daytona International Speedway to drive the No. 22 in Saturday's Coke Zero 400. The car was originally being prepped for Kenny Wallace after the 6 p.m. announcement of the failed drug test, but Hornish was flown in and arrived shortly before the race. Hornish, like Allmendinger a former Indy Car race winner, started in the rear of tonight's field due to missing the driver's meeting.