Malaysia are on the verge of claiming their first ever success in the competition following their 3-0 drubbing of Indonesia in the home first leg, but Rajagobal is taking nothing for granted in the return match at the Gelora Bung Karno Stadium.
"I have arrived in Jakarta with optimism because we have a three-goal lead but we know it will not be easy playing against a good team like Indonesia in front of their home fans," Rajagobal was quoted on the official Suzuki Cup website as saying.
"We have to play well and our focus must be very high throughout the game. As they are playing at home and their fans will be completely behind them, they will attack us from the start and they will try to get an early goal to cut the deficit."
"We faced the same situation against Vietnam in the semi-finals and it will be another tough match. But hopefully, [the] match will be played in a good spirit and we will give the fans an exciting game to watch."
A Safee Sali brace and a fine Ashari Samsuddin goal from distance put Malaysia in a commanding position for the second leg - and they remain confident of getting the away goal which could provide the killer blow to Indonesian hopes.
"I come out for every game with the same intention - to try to play and score goals and win the match," Rajagobal said.
"Even with a three-goal lead, we cannot afford to try to play for a draw against good opponents like Indonesia.
"We will try to play a bit offensively and we will try to be as well organised as possible. Our tactics against Vietnam may have appeared defensive but we will still trying to score to put ourselves into a stronger position."
Malaysia beat Vietnam 2-0 at home in the first leg of their semi-final clash with the cup holders and eventually held on for the 0-0 draw in the second leg in Hanoi to progress.