Sage Karam and Sebastian Saavedra will share the fourth Chip Ganassi Racing entry for the remainder of the 2015 IndyCar season.
Karam, who is contracted to Ganassi as a development driver, took the wheel of the team's #8 car for the first two races of the season at St Petersburg and NOLA (pictured), earning finishes of 19th and 18th respectively.
Under the new arrangement, he is scheduled to return to the cockpit at Barber and the Indianapolis 500, after which he will contest the balance of the season until the penultimate round at Pocono.
"I'm grateful to Chip and the team for their ongoing commitment to me, and I can't wait to get back in the car at Barber," Karam said.
"I just take things one day at a time and nothing has really changed for me since I started as a development driver here- when Chip calls, I'm ready to go race."
Saavedra, who has been available since parting with KV at the end of last season, will race at Barber, the Indy road course - where he earned pole last year - and Sonoma.
"It's good to be back in the series," said the Colombian. "I'm very grateful to Chip and the team, which have had an incredible history in the sport, and specifically in the Indianapolis 500.
"I'm looking forward to Long Beach and doing everything I can to help get the #8 car to the front."