Lizarazu, 43, who played for France 97 times, said: "The Beckham debate is to know whether David Beckham is a marketing product or a football player.
"I'm sorry, but when you go to China to promote football 10 days before the most important game in PSG's history, then it's not good preparation, it's not professional. No other big club would let a so-called player go so far away.
"If he's sold to us as a marketing product, then that's great.
"Since he has arrived, people are talking about PSG the world over.
"But the ambiguity is that they're trying to make us believe he's still important for their sporting project."