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I don't recall anyone from rep level doing this since Colin Scott's. At 22 he's not out of options if it doesn't work out, I suppose.
"The Wales winger Louis Rees-Zammit has stunned the rugby world on the eve of the Six Nations by announcing a career switch to American football with immediate effect".......
https://www.theguardian.com/sport/2024/jan/16/louis-rees-zammit-quits-rugby-in-shock-move-to-pursue-dream-of-nfl-career-gloucester-wales