Fernando Alonso says Formula 1's change of regulations in 2021 could tempt him back to the grid.
Alonso walked away from F1 at the end of last year after four seasons at McLaren which saw his world champion talents squandered often in the lower reaches of the field.
The two-time Formula 1 champion has secured two legs of the 'Triple Crown' and added a third world title to his collection in the World Endurance Championship, but victory at the Indianapolis 500 to match Graham Hill's unique benchmark remains elusive.
While Alonso will prioritise that and a potential tilt at the Dakar Rally in 2020, he did not rule out looking to make a return to F1 in a year that would see him turn 40, if Liberty Media's shake-up is to his liking.
"I need to figure out a couple of different challenges out of Formula 1, they're not yet finished, like Indy 500 and other stuff," Alonso told Sky Sports.
"In 2021, with the new regulations, it's a good mix that we can find there and a different Formula 1 than we see now.
"The reasons why I left Formula 1 are still present with domination with a clear team and races too predictable, but in 2021 there's a chance it could change and could be a good opportunity.
"Any other sport is a little more unpredictable than Formula 1, MotoGP is more unpredictable, Indy is more unpredictable.
"I think the new regulations are made for that, to level the field and to have more options.
"The only bad thing is the calendar, 22 races is non-stop. I'm getting old!"
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