Conor Daly has received a late call-up to join Team Moore Racing for next weekend's Indy Lights round on the Houston street circuit.
The American, who is currently fourth in the GP3 standings, said that he was optimistic about his chances despite not having raced a Lights car since 2011.
"I'm very excited to get in a Lights car with Team Moore Racing," said the 21-year-old. "They're prepared at a high level and I can't wait to get on the street course in Houston.
"It's been a while since I've been in the car, but I am confident we can get up to speed quickly."
Daly recorded five Lights starts with Sam Schmidt Motorsport in 2011, earning a win at Long Beach.
He made his IndyCar debut in a second AJ Foyt entry at this year's Indianapolis 500.