INTERCHANGE rotations may only occur after a goal or another complete stoppage of play in the future, says football operations manager Mark Evans.

Rotations were limited to 90 for 2016, not including changes made at the breaks between quarters. Previously, rotations had been capped at 120.

Evans told ABC Radio further changes could be ahead.

"Somewhere in the future, I'd like to trial whether we just do interchanges after goals or when the play has completely stopped because of a blood rule or a stretcher," Evans said.

"That could be beneficial.

"It could be (trialed) through a pre-season match, or it could be through another competition."

The number of rotations a team is allowed may be up for further change as the game evolves.

"I don't have a theory that there is an ideal number. It is worthwhile testing whether we think the game has benefited because of (fewer interchanges)," he said.

"If we felt a reduction was better, it would be better to do that in stages.

"The SANFL has dropped their rotation number to 60 this year, so it will be interesting to watch that."

Coaches and players have previously been opposed to any form of cap on rotations, saying it puts players at greater risk of injury.