Sienna Yeo was a junior with the Wollongong Collegians JRLFC and developed through the Illawarra Steelers pathways program. In 2024, she played a key role in the Steelers’ maiden Harvey Norman NSW Women’s Premiership title, coming off the bench in their 10-6 Grand Final win over the Newcastle Knights

Yeo was also part of the extended NSW Under-19s squad in 2024, showcasing her potential at the state level. In July 2025, Yeo made her NRLW debut for the Newcastle Knights in Round 1, coming off the bench in their season opener against the Bulldogs . She is contracted with the Knights until at least the end of the 2026 season .

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