Singapore swimmer Joseph Schooling said he is looking to add two more events, the 200m butterfly and 200m individual medley, taking his total to four, in his programme at the next Olympics, after winning the country's first swimming medal at Rio de Janeiro Games.

Addressing local and international media at the Sports Hub's Black Box Auditorium, he revealed his intention to become an all-round competitor, saying: "I think I can medal in the 200m butterfly. I've been training the 200m fly that's why I can finish the 100 well.

"I did the 100m free, first time at the Olympics and finished in the top 16. I want to do the 200m individual medley, it'll be a good all-around race. (So) maybe focus on 3-4 events."

Schooling topped the 100m butterfly final in Rio in an Olympic record time of 50.39 seconds, ahead of Michael Phelps, Chad le Clos and Laszlo Cseh who all finished in 51.14 seconds for a joint silver.

The Singaporean also swam in the 100m freestyle and reached the semi-finals.

Schooling, who is Singapore's first Olympic champion, also spoke about his national service deferment.

On Monday, Defence Minister Ng Eng Hen said the swimmer's NS deferment will be extended till after the Tokyo Olympics as he fulfilled all conditions.

The University of Texas at Austin student said: "First of all, I'm very honoured and privileged to be granted this deferment by NS. I worked hard for it. This will give me a push for 2020.

"I'd rather be thinking about 2020 now for the long run and having this deferment kind of lifts the weight off my shoulders."