Brian Vickers will be sidelined for at least three months while the NASCAR driver is taking blood thinners.

Vickers said Sunday that he hasn't given up on his racing career after his latest medical setback.

Two days after blood clots were discovered in both of his lungs, Vickers came to Auto Club Speedway to support his Michael Waltrip Racing team. His No. 55 Toyota will be driven by Brett Moffitt.

The 31-year-old Vickers has endured three bouts of blood clots and open-heart surgery. He went to a hospital Friday after feeling pain in his chest following a cross-country flight.

He must remain on blood thinners for three months, preventing him from racing. Vickers says he doesn't know what's next, but he hopes to get back in a race car someday.