1. None of that can modify 'fan' because Neville and Seamus are also there. 'Up' is an adverb, which I would say modifies 'joined'.
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eipjoo I guess ‘West Ham’ is name of a team, and Dean is a fan of the team; but we don’t know the rest (Neville, Seamus) are fans for the team. Is this right understanding?Yes, that's right.