Giuly played for both Barca and PSG during his career.
On talk of hat-trick Kylian Mbappe now replacing Leo Messi as the world's best, Giuly scoffed.
"Calm down and watch out for contempt. Mbappé will soon be the Ballon d'Or. We all know that. But he still needs consistency. What Leo has done in the last fifteen years cannot be compared to a hat-trick, even if it were sublime," he continued.
"I do not like to forget all or want to rewrite history. These comparisons are meaningless. Suffer let Kylian make his own way. He has other qualities: he's very fast and skilled. He plays on the wing, while Leo moves more through the centre. Mbappé's destiny is not to be a new Messi, but to become Mbappé."