Vandoorne is fighting to remain at McLaren in 2019 as it evaluates its reserve driver Lando Norris to partner the already-confirmed Carlos Sainz in the team, with Fernando Alonso leaving F1.

Mercedes junior Esteban Ocon has also been linked to the second McLaren seat, with rumour in the Belgian Grand Prix paddock suggesting a driver merry-go-round could be triggered as early as next week’s race at Monza.

Lance Stroll is expected to race for Racing Point Force India next season - after his father Lawrence invested in the team - but said on Thursday nothing was guaranteed in terms of finishing the current season with Williams.

The suggestion is that should Stroll change teams, Ocon would be shuffled out of Racing Point Force India – with McLaren, in place of Vandoorne, his mooted destination for the rest of 2018.

Asked if he could guarantee he would be racing at Monza for McLaren, Vandoorne said: “I don’t have any doubt.

“I think these days there’s always a lot of rumours and a lot of question marks in the press but from my side I’m 100 percent confident.

“The only thing I can do is to focus on my job and I think I’ve shown that I’m very, very close to Fernando.

“I think some of your colleagues have made up some statistics to show how close teammates have been with Fernando and I think I’ve been pretty much right up there.”

Vandoorne has had a difficult two seasons compared to Alonso, particularly in terms of results. He has eight points to his teammate’s 44 this year, although Alonso only outscored him 17-13 last season.

Stoffel Vandoorne, McLaren, walks the circuit with colleagues Photo by: Sam Bloxham / LAT Images

Vandoorne enjoyed a turnaround in form in Hungary prior to the summer break, having benefitted from a change of chassis.

Asked by Motorsport.com why he is confident about his future and whether it is in his control, Vandoorne said: “I think the only thing I have in my own control is the performances on track.

“I know I had a difficult run of races before Hungary with the problems we had on the car but then we showed that everything was back to normal in Hungary.

“So, I’m very confident for the next couple of races that the results are going to be back to where they belong.

“It’s still not going to be a miracle in the position we are in at the moment but I’m feeling positive.”

Should he lose his McLaren drive, Vandoorne’s chances of staying on the F1 grid appear limited to convincing a team like Toro Rosso or Sauber to pick him.

Pressed on the prospect of a team change next year, Vandoorne said it “depends on the situation”.

He added: “The past few weeks, so much has happened in the Formula 1 paddock that everything has become a bit unpredictable.”

Additional reporting by Jonathan Noble