Alonso and Aston Martin announced on Thursday that the 42-year-old Spaniard would remain with the Silverstone team for at least the 2025 and 2026 seasons.
Speaking to the media after the announcement, Alonso revealed he signed a multi-year deal that will keep him associated with the brand beyond his driving days once he decides to retire from F1.
"It's a lifetime project in a way for me, this is the longest contract I ever signed in my career," the two-time world champion said.
"This is something that will keep me linked with Aston for many, many years to come. Let's see which role, let's see how many more years I will drive.
"But even after driving, I will use 25-plus years of experience in Formula 1, plus another 10 or 15 outside F1, so nearly 40 years' motorsport experience in the benefit of a team that gave me this opportunity now in this moment in my career.
"So, this is also very appealing for me and I'm extremely motivated for the next years to come."
Source: Autosport