Valtteri Bottas has said that he has no plans to add the 'triple crown' target to his itinerary anytime soon.
Fernando Alonso has made waves in recent years, after targeting the elusive goal of adding Indy 500 and Le Mans victories to his Monaco Grand Prix win.
The Spaniard came close to Indy victory last year, and in 2018 will do the full WEC calendar as he tries Le Mans for the first time.
Asked if he has similar ambitions to Alonso, Mercedes driver Bottas told Ilta Sanomat: "If he feels he has the time and energy for that, it's no issue.
"Maybe he likes to try new things because he's been in Formula 1 for a long time.
"But at this point I don't think I would like to start mixing other series with the Formula 1 season. I'd rather focus fully on Formula 1."
Indeed, the F1 calendar has already swelled to 21 races for 2018, and Liberty Media has talked about adding even more races in the near future.
"We have 21 races now but 25 is definitely the upper limit," Bottas said.
"It's going to be difficult on the logistics side to do that. There are the people to think about and costs will also get a lot higher if the teams have to get more people in."
The 2018 season gets underway with the Australian Grand Prix in March.
