Marshall said he was pleased at the arrival of Moore from Brentford last week.
He told the Western Mail: "Simon's been great as well. He's a really nice guy and obviously we needed a third goalkeeper too. He's got a lot of experience, playing every game bar a couple for Brentford last year, and they came very close to getting promoted. He's still only young so I think he's a really good signing for us as well."
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