The Portugese star was snapped up for £6m from Porto and joined Dean and the lads for the first time when pre-season training began on Thursday.
Defender Dean stated: "We've signed a good young striker with a lot of potential and I'm sure he will be a great striker for the future. It's a lot of money at £6m, especially in the current market. It shows the board is backing the manager."
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Dean Richards believes the arrival of Helder Postiga underlines the club's ambition.