Stoffel Vandoorne says McLaren have yet to explain why he has been dropped from their driver line-up for 2019 and recognises his chances of finding a seat in F1 next season are slim.
The Belgian has partnered Fernando Alonso for the past two years, but McLaren will have two new drivers next year in the form of Carlos Sainz Jr and rookie Briton Lando Norris.
Vandoorne has been regularly outperformed by veteran Alonso, who is to leave F1 at the end of the season.
But he still expected to have been told McLaren's reasoning by team boss Zak Brown.
"Obviously it was the team's decision, and I have to respect the decision," he told reporters at the Singapore Grand Prix.
"But there hasn't been a clear explanation why. I think that's a question for them to see their exact strategy for the future.
"It would be nice to know. But I think there's not much to explain."
With many teams finalising their drivers for next season, Vandoorne concedes his chances of staying in F1 next season are diminishing but he remains optimistic of earning a drive.
"Obviously I know exactly where I stand, my position for next year. At the moment there's nothing decided for next year, probably similar situation to Esteban [Ocon] let's say," he added.
"The driver market has been strange for a couple of weeks know and things are moving. Seats are closing down almost every day.
"The chances to be on the F1 grid next year are very slim, but until everything is fixed I guess you've got to keep talking, keep trying, and give everything for it. That's the only thing I can do at the moment.
"We are exploring some different series as well, which hopefully in the next couple of weeks I will know something more about.
"Until the Formula One door is closed, you've got to keep all the options open. There's some interesting projects that could become a possibility for next year but at the moment nothing is done, still a free agent let's say."
|Seahawks rally past Packers|
|Lakers G Rondo to miss 4-5 weeks|
|Durant is done with questions about Green|
|Smith, Warner set to return to IPL in 2019|
|No rivalry between Mbappe and Griezmann – Deschamps|
|Neymar: Emery will bring success to Arsenal|
|Jedvaj backs Croatia to deliver against England|
|Howell grabs first-round lead at Sea Island|
|Rooney backing Kane to break England record|
|Betts named American League MVP|
|Republic of Ireland must improve, says under-pressure O´Neill|
|Injured Sergio Ramos to leave Spain squad|
|Yelich named National League MVP|
|Low praises ´beautiful goals´ from Sane and Gnabry|
|Belgium boss Martinez pleased with patient Batshuayi|
|Wilson and Sancho pay tribute to England ´legend´ Rooney|
|Rooney gave England squad a lesson in humility - Southgate|
|This Week in U.S. Sports: LeBron passes Chamberlain, Williamson looking like he is next|
|We still have a chance - Luis Enrique not giving up hope after Spain defeat|
|Rockets ´parting ways´ with Anthony|
|Rooney became ´embarrassed´ at Manchester United|
|Federer: ´Easier´ to play when I´m up against it|
|Rooney convinced England are in safe hands with Southgate|
|Black Caps skipper Williamson confident over first Test availability|
|Federer cruises into last four of ATP Finals for 15th time|
|Republic of Ireland 0 Northern Ireland 0: Randolph saves light up bore draw|
|England 3 United States 0: Experimental side impresses on Rooney farewell|
|Croatia 3 Spain 2: Jedvaj keeps World Cup finalists in contention|
|Belgium 2 Iceland 0: Batshuayi rekindles Hazard flame with match-winning brace|
|Germany 3 Russia 0: Sane on target as Low´s men stroll|
|´Fancy taking a look at Brexit?´ - Southampton credit Austin with VAR breakthrough|
|Green: Altercation with Durant will make Warriors stronger|
|Juventus star Dybala dismisses Manchester United links|
|Strinic given all clear to return to AC Milan training|
|Papier wait over as scrum-half starts for Springboks|
|MLB commissioner Manfred gets five-year extension|
|South Africa international Du Preez joins brother at Sale|
|Pogba and Sterling support my football dream, says Bolt|
|Asensio wants to ´feel more important´ at Real Madrid|
|Former Roosters and Cowboys centre Linnett joins Hull KR|
|New team tournament ATP Cup wins Djokovic´s approval|
|Roma and Pallotta donate €150,000 to injured Liverpool fan Sean Cox|
|England captain Root reprimanded on frustrating day in Pallekele|
|Jokanovic proud of establishing Fulham´s ´footballing identity´|
|Huget to make first France appearance in a year|
|Mourinho and squad ´united´ despite ´mixed´ start, says Woodward|
|Petaia and Gordon to make Wallabies debuts in Padova|
|Barcelona star Arthur determined not to let Xavi praise go to his head|
|Youthful Netherlands have forged strong bond - Wijnaldum|
|Premier League confirms £5m package for departing chief Scudamore|
|Thiem blasts past Nishikori to keep semi-final hopes alive|
|He´s always got time for me – Gerrard loved learning from Liverpool boss Klopp|
|Kearney and Ringrose return for All Blacks clash|
|Molinari on course for Race to Dubai title, Smith and Otaegui lead|
|Premier League to implement VAR from 2019-20 season|
|FSF urges Premier League clubs to reject Scudamore ´golden handshake´ request|
|Rhinos pull off Merrin coup|
|Ribery apologises for reporter altercation|
|Ford to captain much-changed England, Cokanasiga starts|
|Crotty replaces injured Williams for Ireland showdown|
|Classy Roshen gives Sri Lanka unlikely lead|
|Injured Lukaku out of Belgium-Iceland Nations League clash|
|Rooney ´passionate´ about future coaching career|
|Mehidy spins Tigers to victory despite second Taylor hundred|
|Rooney deserves special England day - Antonio|
|LeBron thinks back to his roots after latest milestone|
|Messi to return for Argentina next year - General manager Burruchaga|
|Walton salutes LeBron after he surpasses Chamberlain|
|Croatia´s Dalic and Modric not out for Spain revenge|
|Rondo to miss ´a few weeks´ with broken hand|