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It's one of the fiercest rivalries in world football. Two giants of the game who have never seen eye to eye, don't like each other and cause a heated atmosphere whenever they meet. No, not Argentina and Brazil; but Diego Maradona and Pel eacute;.

 Jorge Olguin, a World Cup winner with Argentina in 1978, has claimed that Maradona doesn't have a clear idea of what he wants from his team, and that is why they have struggled since his appointment.

"Football can be played well, average and badly, but the most important thing is to have a way, a style, a concrete idea," Olguin told Diario Popular. "Diego has yet to transmit a clear idea about what he wants. In this sense he has yet to define things. Well, he hasn't shown this with the national team. I don't know how Maradona wants to play. Up until now there have been signs, but it hasn't functioned."

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Watch Argentina vs Brazil - World Cup 2010 Qualifying Match Live Stream on September 6th at 00:30 (GMT)