Andretti confirmed the deal on Wednesday, which means the 2022 Indianapolis 500 winner will join Colton Herta and Kyle Kirkwood next season.
It also means that current Andretti driver Grosjean will now face a battle to retain his place at the team, with Dale Coyne Racing’s David Malukas strongly tipped to take its fourth car in 2024.
Fellow F1 refugee Ericsson has won four IndyCar races so far but fell out with team owner Chip Ganassi over the fact he wasn’t being paid like its other drivers – including six-time champion Scott Dixon and the recently-retained Alex Palou.
He said of his new deal: “I’m very happy and proud to be joining Andretti Autosport next season. Andretti is one of the most legendary names in motorsports, so it is definitely a dream come true for me to join this team.
“I want to thank Michael and Dan [Towriss, team co-owner] for putting their trust in me and I can’t wait to get to know everyone in the organisation. It’s a very exciting new chapter in my career and I’m really looking forward to getting to work achieving our goals together.
“Exciting times are ahead and I’m thankful for this opportunity.”
Source: Autosport