Speaking to Bernama, Ridzuan revealed: "I reminded the players not to be complacent and stay focused for the match.
"We will try our best because Terengganu are the favourites in the Malaysia Cup tie."
Ridzuan also said that the players are raring to go as all the members of the squad are fit and ready to give their best performance in the campaign.
"I am confident that they are capable of performing their tasks in the match against Terengganu," he added.
Negeri Sembilan will face Terengganu in their first match in Group C, which also consists of defending champions Kelantan and Pahang.