[1][2] On 15 January 2021,16-year-old Aizil signed for Hougang United prior to the 2021 season as part of the goalkeeping trio of Mukundan Maran and Ridhuan Barudin.
[5] Aizil signed on loan from Hougang due to his enlistment to national service ahead of the 2023 Singapore Premier League with the Young Lions.
[10] In 2022, Aizil was called up to the provisional squad for the Singapore under-23 team ahead of the under-23 AFF Championships[11] held in Cambodia but ultimately didn't make the cut.
Aizil was then called up to the Singapore under-19 team for the under-19 AFF Championships[12][13] held in Indonesia after Hougang's AFC Cup campaign but didn't travel with the squad as he appeared on the bench against Young Lions a few days after the tournament's opening.
Aizil was called up for the team again for the AFC U-20 Asian Cup qualifiers and made his debut against group hosts Tajikistan, producing a man of the match performance as he kept a clean sheet including a penalty save to give The Cubs a hard-fought draw.