Teams will play with a bench of three interchange players and one substitute this season, with the sub named 90 minutes before the first bounce.
To avoid confusion, the sub will immediately pull on a bright green vest.
"Whenever the players go on to the field after that 90-minute threshold, the substitute player must wear the bright green vest," Gieschen said.
"Even if he's in his suit. Even if he's out there, just walking around bouncing the ball and having a look at conditions, he's got to have the vest on."
The media and the opposition club will learn of the identity of the substitute through the official paperwork lodged by AFL officials, but fans can simply look for green.
"Certainly for the fans that get in early, it's a chance to see the sub," Gieschen said.
"People who want to bet on football want as much information as they can. If they're desperate enough to get there 90 minutes before the game to see who the sub is, if they are going to back a first goalkicker or whatever, they're obviously not going to back a bloke in a green vest."
The sub will wear the green vest while waiting on the bench for a chance at a piece of the action, through an injury or a teammate being subbed off.
The player subbed off for the rest of the game will wear a red vest.
If a substitute is sent on before notifying the interchange steward, a free kick and 50m penalty will be awarded.
Last Modified on 02/03/2011 12:45