The loss in Asunción left Brazil fifth in the CONMEBOL standings -- behind Argentina, Colombia, Uruguay and Ecuador -- with just 10 points from eight games so far.
Vinícius started the game alongside Real Madrid teammates Rodrygo and Endrick, but the trio were unable to respond after Diego Gómez put Paraguay ahead in the 20th minute.
We apologise to the fans, who are always on our side, Vinícius told Sportv. But this is a difficult time, we just want to improve I know my potential, I know what I can do for the national team. Of course it's been a very difficult process, because when you don't have confidence, you don't get goals, you don't get assists and good performances.
I know what I can improve. I know what I represent. When I'm better, I'll give everyone else a lot of peace of mind. I know my responsibility, I want to improve as quickly as possible.
The top six nations in CONMEBOL qualifying will progress directly to the 2026 World Cup, with the seventh-placed team going into playoffs.
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