The 23-year-old stunned the world of rugby in January by quitting the sport in an attempt to secure a contract with an NFL team in 2024.
Rees-Zammit is set to join the Chiefs’ practice squad, having impressed during his time on the NFL’s international player pathway.
New head coach Rhian Wilkinson has confirmed Sophie Ingle will remain as Wales captain for the upcoming Euro 2025 qualification campaign.