The 20-year-old joins the Linnets from former league rivals Winchester City, who he helped to promotion via the play-offs in 2021/22, making 25 appearances after arriving in October 2021.
Walster started out at Premier League AFC Bournemouth`s academy and then switched to Vanarama National League Aldershot Town`s equivalent.
He spent five months on loan with Isthmian League South East Division side Chichester City in 2019/20.
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