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Formula E champion and ex-Formula 1 racer Nelson Piquet Jr will test an IndyCar with Team Penske as part of a special rookie test day at Sonoma next week.

The Brazilian, who made a one-off Indy Lights appearance in Toronto, will get his opportunity as teams take advantage of rule 6.2.3 of the series regulations.

That provides for an additional two test days per team if a Lights driver does at least 50 per cent of the running.

Current Lights championship contender Spencer Pigot will run alongside Piquet for Penske, while Sunday's Lights race winner Sean Rayhall is scheduled to suit up for Ganassi.

Carlin's Ed Jones will drive for Rahal Letterman Lanigan, Matthew Brabham will run for Andretti, and Lights championship leader Jack Harvey will appear with Schmidt.

The August 13 outing gives teams additional track time on the 2.2-mile road course before they return for the double-points-paying IndyCar season finale at the end of the month.