Thiago Silva expressed concern about Brazil's form after a 1-1 draw against Senegal on Thursday left them winless in three matches for the first time since 2013.
"If I said I wasn't bothered, I would be lying. Unfortunately, in the last three games we have failed to show our best selves," Silva said in a post-match interview.
"I think we had the best chances but we were lacking a finish. It was a very equal game. We came up short on the last pass.
"We have to try to look at what went wrong and be more clinical with the last ball. Our opponents are more focused and studying our team. We have to get out of this rut."
Sweltering heat affected Brazil, says Alves
Dani Alves suggested the heat, humidity and time zone played a role in a sluggish performance from the Seleção.
"I don't believe quality was missing. The opponents also played well and have good players," said right-back Alves.
"The circumstances were difficult. We have an 11-hour time difference [between Brazil and Singapore]; it's really hot. It's not an excuse, but it affects you.
"It is never easy to win. We are doing our best, but of course winning makes it easier to keep working."
Fizceik
140
it's time for coach tite to change some players now. I know there are many better players out there
didadinors
91
Thiago Silva is right, more focus, but truth is: Ederson a supposed world class keeper is over hyped & isn't all that great, especially against Colombia blowing a 2 goal lead. With Alisson we'd have had at least 2 victories now for sure.