Fernando Alonso hinted on Friday he is considering making a return to Formula One following an overhaul of the rules for the 2021 season.
But the two-time world champion Spaniard, who 'retired' last year after a disappointing spell with McLaren, was enigmatic when asked if he was in contact with any teams.
"Let's see," he said, during an interview with Sky Sports F1.
"I need to figure out a couple of different challenges out of Formula One that I need to complete.
"They are not yet finished -- like the Indy 500 and some other stuff. So, 2021, with the new regulations... I think it's a good mix that we can find there and maybe a different Formula One than what we see now.
"The reasons why I left last year are still present now with domination of a clear team and the races a little bit too predictable, but in 2021 these things can be changed and maybe it's a good opportunity."