Jenson Button has described his one-off return to Formula One at the Monaco Grand Prix as the "dream for a racing driver".
Button is McLaren's reserve driver but has previously declared himself retired after being replaced by Stoffel Vandoorne for the 2017 season.
However, he will step into the breach in Monte Carlo on May 28, filling the void with Fernando Alonso missing the race in order to compete in the Indy500.
And, speaking to Sky Sports, 2009 world champion Button said: "When the chance came to race in Monaco, I was going to take it.
"I don't want to be racing in Formula One for a whole season because I've done my time in Formula One, I've loved most of my career but it was time for me to have a break.
"But to come back for the Monaco Grand Prix, I mean that is just the dream for a racing driver; coming in for a one-off race, in Monaco, the most glamorous grand prix on the calendar, it's that excitement is back."
The 2017 cars are wider and boast bigger tyres, while being faster through corners due to aerodynamic changes, leaving Button with plenty to adapt to ahead of his cameo appearance.
He added: "You jump into the simulator and after five laps there's that 'okay, I've still got it then'. I can still direct the car around the corners and I still know how to change gear and push the brake pedal and modulate the throttle.
"That never leaves you."