Max Verstappen suspects Fernando Alonso is looking outside of Formula 1 because the Spaniard's motivation has gone.
Many have hailed Alonso for not only continuing to focus on formula one, but also expand his horizons by targeting the 'triple crown' including Le Mans and Indy 500 wins.
'Drivers who are not winning'
But Red Bull's Verstappen says he is not interested.
READ: Indy 500 'high priority' again - Alonso
"Doing things outside F1 is something that happens mainly with drivers who are not winning," said the Dutchman.
"Maybe. If I'm old and slow I will do it. When you have the best car on the grid, everyone can win with that car. Any F1 driver could have won in the Mercedes for the last four years. Everyone knows that.
That's why you don't see Hamilton leaving to do these things because he doesn't need to. It's the same for me.
I'm in a position to fight for victories so my motivation is very high and I don't want to do Le Mans or Indycar or whatever," when asked if he is interested in following Alonso to America and Le Mans, Verstappen answered.
"My father had the same problem. He (Jos) was in F1 but he didn't win, and there's a moment when the motivation simply disappears and it kills you inside," said Verstappen, referring again to Alonso's change of focus as well as his father Jos.