Ong started his professional football career by signing for the Singapore Premier League side, Albirex Niigata (S) on 16 December 2019.[1]
On 18 October 2020, Ong made his professional debut with Albirex Niigata (S) against Young Lions by coming on as a substitution for Ryosuke Nagasawa in the 86th minute, playing till the end of the match.