FIA President Mohammed Ben Sulayem has claimed the presence of Andretti and General Motors will "bolster the long-term sustainability" of F1.
American outfit Andretti took another vital step towards the F1 grid as partner GM, which has put forward the Cadillac brand to feature in the prospective team name, announced it has registered with the FIA to become the sport's seventh power unit supplier from the 2028 season.
The move has played against a major sticking point for the entry bid against F1 and the incumbent teams, who have expressed concerns over the value Andretti Cadillac Racing could bring to the sport.
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Ben Sulayem 'delighted' with news
Ben Sulayem has been forthright in his support for Andretti's F1 entry despite initial - and subsequent - pushback from FOM and the teams and reacting to GM's announcement, he wrote: "Delighted with the news that General Motors have registered as a power unit supplier for the FIA Formula 1 World Championship.
"This is a further endorsement of the FIA's PU regulations.
"It also follows the approval of Andretti Formula Racing's Expression of Interest application.
"The presence of iconic American brands Andretti and GM bolsters the long-term sustainability of the sport."