The 20-year-old has joined in a €9m deal that could rise to €12m depending on appearances and the English club's performance. Postiga, who scored five goals in Porto's triumphant UEFA Cup run only to miss the final through suspension, has signed a five-year contract.
Speaking to Tottenham's official website, manager Glenn Hoddle said: "He is a player who will add definite striking quality to our squad and is a young player of proven ability. I'm sure our supporters will enjoy watching him over the coming seasons."
Postiga was a major influence in Porto's treble-winning season when they added the Portuguese league and cup double to their European success. He scored 19 goals in all competitions, form which led to his full international debut earlier this month when he found the net twice in a 4-0 friendly win against Bolivia.
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