The 20-year-old, who was born in Sydney, Australia, is also the first cousin of cross-code rugby player Sonny Bill Williams.
Raffie signed his first professional contract at Highbury back in 2021.
Since then, he has also had loan spells at Kendal Town, Nantwich Town and Bamber Bridge.
He could make his debut for his new club on Saturday, as Marine face Whitby Town.
Picture Credit: Fleetwood Town
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