Last night the boy's mother posted a message on Facebook warning other Massey High School parents of the incident.
"Last night my sons life was threatened outside the School while he was waiting for a ride after his league training. He was held at knifepoint and taken from the school."
She said her son was "ok" and was thankful he escaped with no harm but warned other parents to watch out for their children.
"Parents keep your Children safe and know where they are at all times. Have someone waiting there earlier or make sure they are in groups."
The school couldn't be reached for comment tonight.
A police source said the incident was being investigated as an aggravated robbery.
Police are looking for a tall Maori man described as chubby with blue eyes - which were reportedly bloodshot.
His is estimated to be in his 30s with short curly black hair wearing a white singlet and camouflage patterned shorts.
The teenage victim's bag has not been found. It is a black Adidas bag that had two cellphones and his league boots inside.