Sydney Swans champion Adam Goodes has been given leave of absence and may not play in Saturday's clash with the Crows.

Goodes has been subjected to booing from opposition fans for most of this season, but despite pleas from the Swans, and several peers in the industry, the issue continues.

The dual Brownlow medallist was missing when the rest of the senior squad went through their paces at the SCG for a light training session on Tuesday.

Adelaide's Rising Star nominee Jake Lever asked Crows fans to repay the respect they'd been shown by other supporters by not booing Goodes when the two sides clash on Saturday. Patrick Dangerfield also echoed similar sentiments on Adelaide breakfast radio.

Swans coach John Longmire said the emotional wellbeing of his player was paramount, and that Goodes was no certainty to take on Adelaide at the SCG.

"This is clearly an issue that he's concerned about and is sick of, and needed a couple of days (off).

"That's the most important thing, is that we address (the issue) and support Adam as much as we can," Longmire said following training.

"He's a very, very strong individual and he's able to go about his business on a week to week basis.

"Sometimes though, we can assume that it doesn't hurt, and it does."

"Adam's a very strong person who has done a lot for the game, but don't assume that these things are easily washed over and don't affect him in some way.

"It's affected him.

“He's tried as hard as he can to try and move on, and we tried to address it in a way that we thought was appropriate at the time, but he's had enough of it."