Nathan Noël Romejo Tjoe-A-On (Indonesian pronunciation: [ˈt͡ʃuˈäˈon] choo-ah-on;[4] born 22 December 2001) is a professional footballer who plays as a left-back or defensive midfielder for EFL Championship club Swansea City.

[8] On 13 August 2023, Tjoe-A-On signed for Championship club Swansea City for an undisclosed fee on a three-year deal.

[11] On 13 August 2024, Tjoe-A-On made his senior debut for The Swans in the EFL Cup first round match against Gillingham in a 3–1 win.

[12] On 17 August 2024, Tjoe-A-On made his league debut as a substitute in a 3–0 win against Preston North End, thus becoming the first Indonesian to play in the EFL Championship.

[16] In April 2024, Tjoe-A-On was named in the Indonesia U23 final squad for the 2024 AFC U-23 Asian Cup held in Qatar.