[4] This ruling was eventually overturned, and Swainston made his professional debut on 7 April 2017, coming on as a 69th-minute substitute for Hélio in a 10–0 victory against HKFC.

[5] On 24 July 2018, following a preseason friendly, Hoi King confirmed that they had acquired Swainston on loan.

Mark would make his debut in the 3-0 victory over HKFC in the Hong Kong FA Cup quarter-finals, coming on as a substitute for Leon Jones.

[7] Swainston made his debut for the senior Philippines national team on 26 March 2024 in a World Cup qualifier against Iraq.

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