The appearance in the Warriors' AFC Champions League game in Japan against Kashima Antlers two years ago ranks as his career highlight.

Enlisting in the Singapore Civil Defence Force in October 2009, he found things difficult, juggling training at Clementi Stadium with his national service commitments.

Zulfadli made only one appearance for them before the end of national service, as a substitute against Etoile FC in a Singapore Cup Quarter Final second-leg game at Queenstown Stadium, which he won 1-0.

Following his completion of national service, Zulfadli return to Singapore Armed Forces FC where the 23-year-old was on the bench against Home United FC, as the Warriors lost 4-0 on 16 Oct.[3] On his first start at the Hougang Stadium three days later, he justified coach Richard Bok's faith by netting the clincher in a 3-1 win with a cracking goal from 20 metres out on the left that left Fadhil Salim sprawling.

Due to Noh Rahman's retirement from international football, after he was included in the squad for the 2016 AYA Bank Cup, he was called up as a replacement.