This is all I found on the Guardian's site (bolding is mine):
Zidane was provoked, says agent
Zinedine Zidane's chestbutt on Marco Materazzi was "provoked" by a comment from the Italy defender, according to the player's agent. And, while Alain Migliaccio did not know what Materazzi said, he confirmed that Zidane would reveal the exact nature of the comments soon.The former French captain was sent off in the World Cup final - his last game before retirement - after driving his head into the chest of Materazzi in extra-time. But Zidane's agent, Migliaccio, claims Materazzi insulted Zidane, the French-born son of Algerian immigrants.
"He was very sad for everything that happened but this is life," said Migliaccio. "He is a human being not a god. Materazzi said something very grave to him, I don't know what it was. I know Zizou well and he will not reveal what Materazzi said to him but he will in one or two days' time explain why he had such a reaction. When I saw him at 2am he was very sad, he didn't want to end his career like this. He is a person that doesn't say much but bottles it up and then one day explodes."
In an odd twist, Fifa awarded the 34-year-old the Golden Ball as the player of the tournament. When asked whether Zidane knew he had been honoured by world football's governing body, Migliaccio added: "Zidane was on a plane with the rest of the national team back to France. He has a lunch meeting with the president [Jacques Chirac] at one. I am sure that he has found out by now."
Since he has retired, Zidane will escape suspension unless he returns to the game as a coach - something Migliaccio thought unlikely. "He will rest for six months and he has a lot of commitments with his sponsorship contracts, for example with Danone, and his children foundation," he added. "I think if he decides to coach he will only coach youngsters."
Zidane received sympathy from team-mates and opponents; however some of the Azzurri players insisted the butt that led to his sending off was not out of character for a man who collected 14 red cards during his career. Italy's goalkeeper Gianluigi Buffon said: "I saw the incident afterwards on TV. It was an ugly reaction but in football sometimes these things can happen. However, this is not the first time Zidane has done something like this."
Materazzi, who like Zidane has also had a chequered disciplinary record, refused to comment on the incident. The Internazionale defender walked through the press area playing music loudly and ignored requests for interviews.
His agent, Claudio Vigorelli, revealed he spoke to Materazzi after the game but admitted he did not know what made Zidane react as he did. "He was extremely happy but he did not mention the incident," said Vigorelli. "I've known Marco for a long time and I don't think he is capable of provoking a player, he is a good boy. Materazzi is really happy with the tournament he has had. He was in a celebratory mood. I will meet him on Tuesday in Milan and we will discuss what happened."
France's players, meanwhile, were dismayed at the outcome and felt Zidane must have been prompted by Materazzi. William Gallas said: "I don't know what happened. But it must have been something bad for Zizou to react in that way. It's a pity but sometimes when you are playing it's very difficult to contain your emotions when someone is trying to provoke you like that."
The French squad received a rapturous welcome back home today. There was live TV coverage of the team bus speeding into Paris from the airport and of the meeting with President Jacques Chirac. The return drew some national attention away from Zidane's behaviour - at least temporarily. Zidane and the rest of the team had lunch with Chirac, who had words of comfort for the midfielder, acknowledging that it was an "intense" and "difficult" moment in his career. "You are a virtuoso, a genius of world football," said Chirac. "You are also a man of heart, commitment, conviction. That's why France admires and loves you."
Later, the players waved to cheering fans from the balcony of a hotel overlooking the Place de la Concorde. One by one, they stepped to the railing and clapped. The crowd screamed for Zidane, whose teammates pushed him to the front. He bowed his head in acknowledgment. However, French sport minister Jean-Francois Lamour was critical of Zidane. Lamour said he didn't know what Materazzi had done to anger the French captain, but "we can imagine that there was a provocation". He added that Zidane's act was "unpardonable."