I'm agree with Sarcasm, but this is not a closed question but a debatable one (see the work of prof. Villar of Salamanca University, "Los indoeuropeos y los orígenes de Europa"). We only know that Lusotanan were of indo-european origin, and they obviously had a strong celtic influence (as also the celtiberian tribes had) - over their culture and over their language.
But we ignore more than we know about them. So the experts are still arguing about if they were celts or not.
Obviously the best studies about pre-roman Hispania are the spanish ones. If you know/speak spanish I can tell you some good works about that question.
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