"This is disappointing for Colin and the playing group. It's unacceptable for Colin or any other player not to turn up for a recovery session as well as not abide by the players' curfew," Demons skipper David Neitz said.
"I believe the leadership group and entire player group have handled the situation responsibly."
The decision to suspend Sylvia is endorsed by Demons chairman Paul Gardner who says the club will benefit from its strict adherence to discipline.
"He didn't break the laws of the land or the laws of the competition. But he did break the laws of the club, so the club must punish him," Gardner said.
"The club is transparent and there will be no sweeping such matters under the carpet."
Melbourne captain David Neitz says there are not necessarily any glaring discipline issues at the club but that the club's policies had to be followed by all players.
"I don't think there are necessarily issues or problems, but we have set some stiff guidelines for players to meet and there are high expectations, but we play in an elite competition, so the expectations should be really high," Neitz said.