The Bafana Bafana legend was speaking to Goal following Sundowns' unveiling of the player.
Maboe, the son of former Orlando Pirates striker Sidwell, has joined the Brazilians for an undisclosed fee.
The 23-year-old helped Maritzburg reach the Nedbank Cup finals and walked away with the Nedbank Cup Player of the Tournament and Most Promising Premier Soccer League (PSL) Player of the Season Awards last season.
Coach Pitso Mosimane has brought in a number of youngsters to ensure that he builds for the future.
“Yeah look, I don't see it as a bad signing in all honesty because the boy is growing and has showed the country that he takes his game seriously,” Masinga told Goal.
“I am sure he can compete at Sundowns because this is a big opportunity for him, but he must not just be content with the big contract, but must work hard,” he added.
“I don't think they signed him because of the big awards he collected at the end of the season, but because of his work rate at United,” continued the former Jomo Cosmos player.
“He has done well for United until the last hour and credit must also go to Fadlu Davids for developing the player and helping him to make his name known when he was not recognised,” he added
“On the other hand, they gave Sundowns tough times last season, but I don't think the boys raised their game only against Sundowns, but they have always done so against any team in Maritzburg and even away,” said the former Leeds United striker.
“He must now prove a point that he can do it at a big club and ensure scouts will see him and get a move to Europe to come back and help Bafana,” urged 'Chippa'.
“If I remember very well, there were reports that he is wanted in Europe and that is a sign of someone doing very well at his club,” recalled the 1996 African champion.
“Let's just hope he won't rest on his laurels and be comfortable at Sundowns, he must work hard and force his way to Europe and cement his place in the national team,” said Masinga.
“Some players would just feel happy and comfortable with a big pay cheque, but forget about their dreams of taking their careers to the next level,” Masinga continued.
“Competition will be very stiff at Sundowns and coach Pitso is planning well because he doesn't want to be caught napping when it comes to injuries and suspensions,” he reacted.
“They are busy in Caf Champions League, domestic campaign and he will need a team that will replace each other as the season progresses,” he concluded.
Moreover, the former Mbombela United star joins the reigning champions as the seventh first team signing after Toni Silva, Ali Meza, Andile Jali, Lyle Lakay, Mosa Lebusa and Reyaad Pieterse as they look to defend their PSL title.