Patrick Carpentier broke his left wrist in a fall at his Las Vegas home Monday night and will miss the next two CART races, including this weekend's Grand Prix of Long Beach.
Team Player's announced Tuesday that Carpentier will be replaced by Memo Gidley.
Carpentier, a 28-year-old native of Canada, was injured when he lost his balance carrying a heavy suitcase up stairs and then tried to break his fall. Team Player's said he was to have surgery Tuesday night.
"I'm extremely disappointed to find myself on the sidelines after starting the season on such a strong note with a fifth-place finish at Homestead," Carpentier said in a statement.
Gidley, from Mexico, made a combined 10 starts for Walker Racing and Payton Coyne Racing last year in his rookie CART season.
INDY WEATHER: For the third time since Friday, the weather affected rookies hoping to make their first start in the Indianapolis 500. Rain and falling temperatures cut short Tuesday's schedule and the Indy Racing series has extended the rookie orientation program through today.
Veteran Tyce Carlson recorded the fastest lap at 218.150 mph. Jason Leffler, who completed the final phase of his refresher test, had the second-fastest trip around the oval at 215.662.
Testing didn't start until 1:45 p.m., nearly five hours late. The session ended 45 minutes earlier than planned due to plunging air and track temperatures.
Only 10 drivers participated Tuesday with veteran Billy Boat and rookies Casey Mears and Guy Smith on track for the first time.
"It's awesome. I'm loving it," said Mears, the nephew of four-time Indy 500 winner Rick Mears and the son of two-time Indy 500 starter Roger Mears. "It's totally a different place than I've been before and it's very special."