Irfan's charges have already disposed of reigning champions Kelantan and 32-time Malaysia Cup winners Selangor in this season's competition, experience that he believes will stand the Terengganu squad in good stead come this weekend's showdown at the Shah Alam Stadium.
"We have proved that we are not pressured by thousands of opposing fans, as we showed against Kelantan when we played them," Irfan said.
"I believe my players will remain calm when playing in the final, and I am sure that the team that makes lesser mistakes will emerge the winner.
"I want my players to win this match in 90 minutes, however, we are ready to play longer if needed to," he added.
This Saturday's clash between Terengganu and Negeri Sembilan represents the first time the two teams have met in the final of Malaysia's elite club competition for 90 years.