West Ham's Australian captain Lucas Neill is undergoing tests after suffering a knee injury during a training session.

A West Ham spokeswoman said the right-back would undergo a series of scans, with the results expected to be known later on Wednesday.

"He did take a knock in training, but we don't yet know the extent of his injuries," she said.

The Daily Express newspaper reported that Neill had been advised to rest for at least 10 days, meaning he is likely to miss the start of the English Premier League this weekend.

But the club's spokeswoman said it was unclear exactly how Neill was injured or how long he could be out for.

Neill, who joined West Ham in January, has only recently returned to England after Australia's Asian Cup quarter-final exit.

News of his injury comes after his Socceroos teammate and star Everton midfielder Tim Cahill injured his foot during a 2-2 friendly draw against Werder Bremen last week.

Cahill has been undergoing a series of x-rays to determine the extent of a foot injury which could sideline him for the start of the Premier League season.

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