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The 29-year-old shared his sentiments during DAZN’s 'Neymar & The Line of Kings' documentary; a confession perhaps borne more out of reputation than age.
Some sections of the Brazilian media have taken issue with the star attacker, recently suggesting he was out of shape despite producing an influential performance against Peru in September.
And now, after admitting “I don’t know what else I need to do with this shirt for people to respect Neymar”, the Paris Saint-Germain man believes his time could be up.
“Man, I think it will be my last World Cup,” Neymar said in a video published to DAZN’s Twitter feed.
“I am facing it like the last World Cup because I don’t know whether I will be able to, mentally, endure more soccer.
“I will do everything possible to get there very well… I will do all I can to win it with my country and realise my dream, the biggest since my boyhood.
“I hope I can achieve it.”
Neymar has featured in two World Cups throughout his career, having taken Brazil to the semi-finals on home soil in 2014, before bowing out to Belgium in the last-eight four years later.
The Selecao are well-placed to qualify for Qatar's instalment, with Monday's (AEDT) 0-0 draw away to Colombia taking their CONMEBOL tally to 28 points from a possible 30.