New Zealand's Zac Guildford injured in training

New Zealand winger Zac Guildford is an injury worry for the All Blacks after picking up a hamstring strain during training today (Wednesday).

The Crusaders player could not complete the training session at North Harbour Stadium and later said he was unsure of the seriousness of the injury.

"I just pulled up a bit short at training, we haven't assessed it yet," Guildford said. "It's a bit of a hammy."

New Zealand face Argentina in a quarter-final clash on Sunday and Graham Henry is expected to name his starting squad later this week.