EJ Viso has been named as the driver of Andretti Autosport's long-anticipated fourth entry in a car jointly run by Andretti and former Lotus-aligned squad HVM.
"After five years in the series I believe I have found the right environment and look forward to having Ryan [Hunter-Reay], James [Hinchcliffe] and Marco [Andretti] as teammates," said Viso.
"I'm very proud to be able to move into the 2013 season with this new relationship; it's a dream come true."
The deal returns the reigning champion team Andretti Autosport to its traditional stable of four full-time cars after it scaled back to three for the 2012 season.
"We are happy to welcome E.J. to the team and to again be running four cars," said team owner Michael Andretti.
"He has shown speed in his early years as a driver which we view as very promising, and his personality will lend well to the overall chemistry of the drivers and crew.
"I'd like to thank [HVM owner] Keith [Wiggins] and HVM for their assistance in this project."
A team statement indicated that the collaboration with HVM could be a stepping-stone to Wiggins' team returning to the series as a stand-alone entity in 2014.
HVM was left without an engine deal after Lotus withdrew from the series following a disastrous 2012 season.