South Africa will tackle the North Africans tomorrow in their final Group A game, with a draw enough to take Owen da Gama's charges through to the next round in Senegal.
A defeat will see Tunisia progress in the competition, which serves as a final qualifier for next year's Olympic Games in Brazil.
The top three finishers at the event will represent Africa at Rio 2016.
Masuku, who scored in a 3-2 win over Zambia on Tuesday, insists the team will not sit back in M'Bour.
"It is important to go into the match with a winning mentality as we want to get maximum points and also to get respect from other teams in the competition. A win will also boost our confidence as players," said Masuku.
"We determined to qualify for the Rio Olympic Games, so this game will be very important for the team since we want to progress to the next round of competition.
"We just have to remain humble and focus on our goal as a team. As long as we put our hearts in it, we have a good chance of doing well for ourselves and country," concluded the Orlando Pirates midfielder.