Giggs admits his battle with the fellow veteran has been ongoing for over 12 years.
"The most difficult opponent I have ever faced was Javier Zanetti. I met him for the first time in '99, the quarterfinals of the Champions League. Him right back, I left wing. HE impressed me for his qualities: fast, powerful, intelligent, experienced.
"I've played against him two more times. He was the toughest opponent of all. A complete player," said Giggs.