Celtic manager Neil Lennon knows just the kind of influence Kaka can have a game of football.
Lennon has identified Kaka as a major threat to his side and is aware that he will have to keep an eye on him along with star striker Mario Balotelli who has scored 15 goals in 18 matches since joining from Manchester City.
"Kaka's a class player. I don't think he'd be the Kaka of four or five years ago but he's a player who just needs games," said Lennon.
"He's home. This is where he made his name. He became World Player of the Year at Milan.
"Balotelli is strong with his back to goal and you have to watch him in full flow.
"He's very powerful and a lot of good things come through him. He's the pivotal point of their attack."