Gregson previously came to media attention in August 2013 when his school, Sacred Heart College, controversially would not permit him to make his league debut with the Glenelg Football Club due to him being required to play in an inter-school game against Rostrevor College.[3][4]
He attended Sheidow Park Primary School in the southern suburbs of Adelaide.[citation needed] In Round 6, 2015 Gregson was nominated for the 2015 AFL Rising Star award after having 18 disposals and 3 goals against Collingwood.
Gregson was delisted at the end of the 2018 season after a long battle with his fitness and getting his injured foot back to full health.
^McNicol, Adam (4 April 2015). "Final Cats side v Hawks". geelongcats.com.au. Telstra Media. Archived from the original on 4 April 2015. Retrieved 6 April 2015.