[3] He made his debut for Cardiff in the second round of the 2021–22 European Rugby Champions Cup against Harlequins, starting at fullback and scoring a try.

[4] He made his URC debut against Benetton in the final match of the 2021–22 United Rugby Championship season.

[5] Ahead of the 2023–24 United Rugby Championship, Winnett signed a contract extension, transitioning into the first team squad.

Winnett remained in the squad for the 2022 U20 Summer Series, and started every match at fullback, as Wales made the final.

[11] Winnett started at fullback against Scotland on 3 February 2024, making his international debut.