CHARLOTTE, N.C. -- Suspended NASCAR driver AJ Allmendinger says he tested positive for a stimulant he did not identify.

A statement Wednesday from Allmendinger's business manager says the driver is collecting his medicines and supplements to determine if an over-the-counter product caused the positive test.

Allmendinger was randomly tested by NASCAR on June 29, and informed Saturday he had failed the drug test. His suspension was announced hours before Saturday night's race at Daytona.

He has requested his B urine sample be tested, and it's not clear when that will occur.

Penske Racing has already said Sam Hornish Jr. will drive the No. 22 Dodge this weekend at New Hampshire.

Allmendinger said in a Tuesday statement he would never knowingly take something on the banned substance list.

The full statement reads:

In an effort to help our colleagues in the media report on this in a timely and accurate manner, we wanted to provide some additional details regarding AJ s sample A test results. AJ tested positive for a stimulant. He has no idea why the first test was positive, and he has never knowingly taken any prohibited substance. AJ is collecting his medicines and supplements for testing to determine whether an over the counter product caused his positive test. AJ and all of us at Walldinger Racing respect NASCAR's testing program, and he has requested that his B sample be tested as part of the process of getting to the bottom of this. We will have the opportunity to review all of the scientific data surrounding the test following the B sample test, but our understanding is that AJ's test was slightly above the threshold. As of this morning, we have not been given notice of when the testing of the B sample will take place. Thanks again for all of the support of our fans, team, and sponsors as we continue working through the process.

-Tara Ragan, Vice President, Walldinger Racing Inc.

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