Lewis Hamilton would love to race in MotoGP or NASCAR and the Formula One star is hopeful former McLaren team-mate Jenson Button replaces Fernando Alonso when the Spaniard misses the Monaco Grand Prix to race in the Indy500.
Alonso will not line up on the grid in Monte Carlo, instead taking up the challenge of competing in IndyCar's most prestigious race, which McLaren are returning to for the first time in 38 years with their car run by the Andretti Autosport team.
"Firstly it is great that a driver is able to do it, we should be allowed to do more than one series," three-time F1 world champion Hamilton said of Alonso's forthcoming appearance in Indianapolis.
"There was a time when drivers could do multiple series so it is pretty cool.
"I wouldn't want to miss out any races in F1, you need to do all the races.
"I would like to do MotoGP. I'd love to ride a MotoGP bike - or a NASCAR race, like the Daytona 500."
Button is part of McLaren's three-driver line-up, having been replaced in a main drive by Stoffel Vandoorne, but the Briton has previously intimated he is now retired.
McLaren chief Zak Brown said it is not guaranteed that Button will take Alonso's place in Monaco but Hamilton is keen to see his compatriot and the 2009 F1 champion back on the grid.
"I hope Jenson comes back, it would be great for the sport to have Jenson back," Hamilton added. "I still think he is one of the best drivers, his calibre is very high, and he is experienced."
Of the task Alonso will face at the Indy500, Hamilton said: "It is a completely different character [of racing]. It is a lot, lot different.
"The set-up, the banking, how much you lift, how much you use the tyres - it's definitely a lot to learn in a short space of time.
"But Fernando is one of the best drivers in the world.
"He will be the best driver in the paddock [at Indy] but he does not have the most experience, so it will be interesting to see how he copes without that experience."