Team Penske has brought in Oriol Servia as a possible replacement for Will Power in Sunday's season-opening IndyCar Series race.
Power felt ill all day Saturday, when he broke his own track record three times while winning the pole on the streets of St. Petersburg.
Servia got into Power's car on Sunday morning for the warmup laps, and Team Penske said Servia will race if Power is not feeling better.
Team Penske said Power was suffering from nausea. He was involved in a crash during a Friday practice session, but the team has not indicated if the accident and his illness are related.