Ganassi expands to four cars for 2011

Rahal, 21, who became IndyCar's youngest ever winner at 19 with victory at St Petersburg in 2008, drove for four different teams this year.

"This is the kind of opportunity every driver dreams of," Rahal said. "I have been working to get into one of Chip's cars and now that has become a reality.

"I'm thrilled to be a part of this great organisation and look forward to making the most out of this opportunity."

Kimball, 25, finished fourth in this year's Indy Lights standings and graduates to IndyCar with backing from the series' Road to Indy sponsorship scheme.

He is diabetic and his deal comes with sponsorship from healthcare company Novo Nordisk, which he will work with to promote diabetes campaigns.

"I am honoured to join Ganassi and excited to be moving up to IndyCar," Kimball said. "This is a dream come true and I am very proud to work with Novo Nordisk and continue to spread the message that diabetes does not have to slow you down."

Team boss Chip Ganassi added: "It's no secret that we're always looking for ways to get better and expand our racing programs.

"Graham has shown us all over the past few years that he can be a front runner. And many don't realise this, but we have had a relationship with Charlie for a number of years now.

"I have been keeping close tabs on him and his successes in racing whether he was racing in F3 in Europe or running Indy Lights. We're excited to have the opportunity to turn this longstanding relationship into a reality."