"I figure it will be my last World Cup," the 29-year-old told DAZN.
"I will play it like it is the last since I couldn't say whether I will in any case have the psychological solidarity to endure much more football."
Neymar, who has played in two World Cups and is his nation's second top scorer ever behind Pele, will be 34 when the 2026 competition moves around.
"I will do everything to get to the 2022 World Cup fit as a fiddle and will do everything to win for my nation, to satisfy my greatest dream since I was pretty much nothing," added the Paris Saint-Germain star.
Neymar played in the 2014 World Cup on home soil and scored four objectives.
Nonetheless, he was to experience a back physical issue before Brazil were embarrassed 7-1 by Germany in the semi-finals.
After four years, in Russia, Brazil were taken out by Belgium in the quarter-finals.
Up until this point, his worldwide distinctions have been restricted to the 2013 Confederations Cup and an Olympic gold decoration in Rio in 2016.
Injury administered him out of the 2019 Copa America which Brazil won just as the 2021 version where Argentina prevailed in the last.
Brazil are serenely positioned to arrive at the 2022 World Cup in Qatar having won every one of the nine of their qualifiers in the South American district up until this point.
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