This weekend's double header at the London ExCeL circuit precedes the season finale in Seoul, which takes place at the Sports Complex in Songpa-gu built for the 1988 Olympics.
Vandoorne currently leads the drivers' championship by 11 points over Edoardo Mortara , as the two have frequently traded the lead of the standings throughout the year.
The Belgian, who is hoping to deliver a second drivers' title for Mercedes in a row following last year's success for Nyck de Vries , says that he needs to be "on it" in every single session from now on to keep control of the title.
"There's four races to go, but it's getting so close between everybody that the moment you just don't get the car together, you can't have any off-days anymore because you're just going to be at the back.
"The ra