Alonso to retire from Formula 1 at end of season

The 37-year-old Spaniard is competing in his 17th Formula One season and his fifth with McLaren, and has been widely tipped to race in the Indianapolis 500 next year as he attempts to win the 'Triple Crown of Motorsport.'

Alonso, a double Monaco Grand Prix winner, won the Le Mans 24 Hours on his debut with Toyota in June this year and is ninth in the Formula One drivers' championship standings.

"After 17 wonderful years in this amazing sport, it’s time for me to make a change and move on," Alonso said.

"There are still several grands prix to go this season, and I will take part in them with more commitment and passion than ever."

McLaren worked with Andretti Autosport to field a car for Alonso for the 2017 Indy 500 where the Spaniard put himself in contention leading for 27 laps before suffering engine failure with 21 laps remaining.