A teenager has been taken to hospital after being seriously injured in a netball game.

A St John spokeswoman said an ambulance was called out to a game this morning at AMI Netball Centre in Northcote.

"At 9.20am St John was called to attend a 17-year-old female. She was transported to hospital in a serious condition."

The girl has now been discharged from North Shore Hospital.

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Netball North Harbour chief executive Lynette Brady said the girl collided with another player during the game and was knocked to the ground. Brady believed the girl may have a concussion.

"There was an incident as a result of a collision on court where she fell. She has been taken to hospital for observation.

"The player was attended to by a doctor and sports injury clinic staff on site."

Brady said the other player was okay.