The Victorian batsman was facing Sean Abbott at the MCG and in the second session of the day, the incident happened.
Abbott bowled a bouncer in the 19th over of the Victorian innings and Pucovski tried to duck, but the ball hit the left side of his helmet.
The medical staff escorted him out of the ground once he dropped down on his knees.
Past incidents of Pucovski's concussion
The youngster suffered his third concussion of the summer. Last season, he was struck on the head while fielding. He was struck once again during the side's One Day campaign in October, followed by another incident in November 2017.