Justin Westhoff, Jasper Pittard, Cam O'Shea and Ollie Wines have all recommitted to Port Adelaide, signing AFL contract extensions with the Power.
Carlton will turn their attention to re-signing Bryce Gibbs after fellow midfield star Marc Murphy agreed to a long-term deal.
New St Kilda coach Alan Richardson faces a gruelling first year in charge of the struggling AFL club.
The AFL is considering taxing the big-spending clubs to address the gap between the spending powers of the big clubs and their low-budget rivals.
Port Adelaide coach Ken Hinkley says his club still has a long way to go before it can reach the top of the AFL ladder.
Collingwood vs Fremantle
GWS Giants vs Sydney Swans
Gold Coast Suns vs Richmond
Carlton vs Port Adelaide
Can Alan Richardson bring success to St Kilda?