Injured Tana fears 'fizzing' Kiwi will take centre stage.

(From Western Daily Press)

Injured All Black Tana Umaga believes the biggest hurdle blocking his return to the New Zealand side will not be the knee injury he suffered last weekend, but the 'fizzing' form of Ma'a Nonu.

Umaga vowed he had not given up on playing again in this World Cup five days after rupturing the posterior cruciate ligament in his left knee during New Zealand's victory over Italy.

But he predicted Nonu will take some shifting.

"I think the biggest thing for me to get back is the way he has been training and fizzing in our camps," said Umaga. "I would be happy to play, but I don't think I'll get a chance the way this …