Brian Vickers undergoing medical tests; Casey Mears to drive for Red Bull

Red Bull Racing Team officials announced today that due to a recent diagnosis of a medical condition, Brian Vickers will not compete in this weekend's NASCAR racing activities at Dover International Speedway.

Vickers, 26, was hospitalized Wednesday evening and continues to undergo testing and further evaluation. Casey Mears has been selected to drive the team's No. 83 Toyota.

"It is unfortunate that I will not be able to participate in the Dover race. Casey is a good friend of mine, and I know he will do his best for the No. 83 team this weekend," said Vickers.

"Our main concern right now is with Brian and his health and recovery," said team general manager and Vice President Jay Frye. "All things are looking good at the moment; this is just a minor setback. We appreciate Casey filling in this weekend and know he will represent the team well."