Police are seeking information after a man was found injured down a grass bank on Auckland's North Shore, unable to remember what had happened to him.

The 33-year-old was found near the intersection of Park Rd and Glenfield Rd between 5.30pm and 6pm on Monday night.

A member of the public heard yells before finding the man down the bank with moderate injuries to his head, hands and knees.

The man couldn't remember how he was injured but police said it was possible he had been skateboarding.

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A white van was seen at the time and police are keen to speak to the driver.