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Vassallo, 21, scored in the play-off final win over South Shields and scooped the league gong in 2017/18, attracting interest from several clubs higher up the football pyramid as a result.
Yellows boss Paul Carden has also confirmed that defenders James McCarten and Mitch Duggan, midfielders Dom Reid and Russ Benjamin, and forward Connor McCarthy will return for pre-season.
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