Russian racer Mikhail Aleshin will rejoin the IndyCar grid for the 2015 season finale at Sonoma Raceway, reuniting with Schmidt Peterson Motorsports.
Aleshin, 28, contested his debut season in the series in 2014, finishing 16th overall and picking up a maiden podium in the rain-hit race at Houston.
Reported international sanctions against his backers at SMP left him without funding to continue in IndyCar in 2015 and he instead turned to the European Le Mans Series, where he recently took his first podium at Spielberg.
The Russian will now test the DW12 at Sonoma mid-August before officially making his return to the series at the end of the month.
"I am incredibly happy to make my return to this entertaining championship and my team, with which I raced last year and achieved considerable success," Aleshin said.
"This year, my priority is my ELMS campaign and the continuous development of the BR01", he added, referring to SMP's LMP2 WEC project.
"As for next year, we're doing all we can to continue in IndyCar and I hope this race can be a significant step towards that goal."
Aleshin, who was the Formula Renault 3.5 champion in 2010, qualified 12th at Sonoma last year and finished the race in seventh place.