Wardun played for DPMM from 2006 to 2024, having returned from
Wijaya FC after a brief spell in 2004. Previously, he was a squad member of the
Brunei team that participated in the
M-League. Wardun was sent on loan to
Majra FC in 2010 as Brunei (and in extension DPMM) served a two-year
FIFA ban. He became the team captain in that period and even converted a penalty in the semi-final of the 2011 Brunei League Cup. He went on to win the final. Returning to the
S.League with his parent club in 2012, Wardun became the undisputed number one ever since. He did not miss a game in the
2015 season when DPMM finally clinched the S.League title after coming close twice. On 2 April 2017, Wardun dropped to the bench and missed his first league game in three years, allowing longtime rival
Alizanda Sitom to be the oldest player to start in the
S.League. The reason was due to an ankle injury. Another injury to his thumb in May further blighted his season, and in the end he managed only 8 starts in DPMM's disastrous
2017 campaign. Despite a pre-season injury to last season's starter
Mu'izzuddin Ismail in 2018, Wardun was kept away from the starting lineup by the signing of youth international keeper
Haimie Anak Nyaring. He finally made his bow for the season on 3 June against
Albirex Niigata (S) after Haimie was red-carded in the 74th minute. At the start of the
2019 season, Wardun became the starting goalkeeper under new coach
Adrian Pennock, who also appointed him as team captain. He kept three clean sheets in consecutive matches for DPMM against
Home United,
Geylang International and
Albirex Niigata (S) before finally conceding to a
Khairul Amri strike in the 83rd minute in the home victory against
Tampines Rovers on 7 April. His form continued into the second half of the season when on 6 July, in the away game against
Warriors FC, Wardun produced a string of magnificent saves including saving a
Jonathan Béhé penalty and keeping out a point-blank header by
Khairul Nizam in the final minutes of the game to keep the score at 3–3 and thus salvage a point for DPMM. His age-defying save drew gratuitous praise from Pennock who compared it to
a similarly iconic save by one of
England's finest goalkeepers,
Gordon Banks. On 29 September 2019, Wardun lifted the
Singapore Premier League trophy as DPMM captain after a 5–4 win against
Hougang United concluded a triumphant league campaign for the Bruneian team. He also boasted the most clean sheets for the season with 10 in 24 games. Wardun announced in January 2020 that he intended to retire at the end of the
2020 season. However, he continued to be affiliated with the club until February 2024. He subsequently moved to
Kasuka FC and made his debut at the
2024–25 ASEAN Club Championship qualifying play-offs against
Shan United on 17 July in a 1–1 draw. He then managed to win the Brunei domestic title with the club after going unbeaten for 13 matches. In August 2025, Wardun was the starting keeper for Kasuka's qualifying matches for the
2025–26 ASEAN Club Championship and
2025–26 AFC Challenge League against
DH Cebu and
Phnom Penh Crown respectively. After failing to advance in both competitions, Wardun was replaced in the squad by
Jefri Syafiq Ishak, ultimately signifying the end of his football career. ==International career==