The pair informed players last week they would be stepping down from the role at the end of this season.
Both will stay on as players.
“We’ve had a bit of a chat over the last month and reached the conclusion that it’s probably best for the club to move forward,” said Casey.
“It’s just a really good opportunity to get a new face in, but also to get a few more faces as well to keep building on the last couple of years,” he said.
The decision comes amid a disappointing season for the Coutas. Hampered by injuries for much of the year, they are set to finish outside of the finals.
Casey, 26 and Hodson 28, became the youngest coaches in the league when they were appointed in 2015.
The Coutas finished second on the ladder and reached the preliminary final in their first season, but Casey admits a lack of depth has challenged the side in recent weeks.
“We’ve had a number of injuries this year, which hasn’t helped either, but injuries happen and you’ve got to have depth to cover them when they occur.
“It’s been really good that we’ve been able to give some young guys a game, but they still need a fair bit of time to develop and we need to look at getting another couple of players, just to try to keep up with all of the other clubs that are recruiting really well,” Casey said.
Club officials have already started the process of finding a new coach.
“I’ve absolutely loved coaching the team and I’d be really keen to do some coaching again in the future. I think it’s been a great learning curve for us in terms of the management of 40 to 50 guys at training and relationships and obviously getting to know how the club really works.”