Sundowns have started their DStv Premiership campaign on a high note and are currently sitting on top of the log with 13 points after five games.
The Brazilians are yet to lose a league match so far this season.
Despite emerging as early pacesetters, Mngqithi is not counting any chickens before they hatch.
"I believe it's too early. It's a 30km marathon and we have just finished 5km, we can't be making noise," Mngqithi said after their 3-0 win over Stellenbosch FC on Saturday.
"We know we are still going to face hurdles and it's every coach's wish and every player's wish to win every match we play, but it's always better to concentrate on each game at a time."
Mngqithi explained: "Because the moment you start to have big dreams, you might falter in your first step. So it's very important we give our best shot in every match we play.
"The next assignment is against Maritzburg United and we must give it all the attention it deserves, and based on that it is very important to keep our feet on the ground, stay humble and stay modest.
"I know what we are capable of but let's not become overconfident because there are still too many games and believe me, the PSL this season is going to be hard."