A man has been rushed to Auckland City Hospital with minor injuries after a concrete slab fell from a construction site, narrowly missing him.

The falling slab of concrete was 2 x 2 metres in size, and fell about a metre on to the road from a truck at the corner of Centre St and Sales St.

It narrowly missed a worker below, but he sustained minor injuries in the incident.

St John Ambulance staff and fire crews attended the scene on the Macrennie construction site shortly after 2pm.

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Company spokesman Steve Fowler said Worksafe had been advised, and the company was also conducting its own internal investigation.

"We're seeing if it was an operator issue - a human error", he said.

The patient is now in a stable condition in Auckland City Hospital.

A Worksafe spokesperson said they had been notified of the incident, and the department is making initial inquiries.