SYDNEY Swans spearhead Barry Hall has questioned the proposal to put a second AFL team in Sydney, doubting whether the city has enough fans of the game to warrant another club.

All 16 AFL clubs voted unanimously in favour of the league's proposal to add two more teams to the competition, one on the Gold Coast and another in western Sydney.

Such was the level of support, AFL chairman Mike Fitzpatrick said last week there was a push to have the new clubs in place ahead of the league's timetable of 2012.

But Hall, who captained the Swans to their first premiership in 72 years in 2005, is sceptical of the idea.

He believes it could even undo some of the progress the Swans have made in recent years.

"In the six years since I arrived here, it's been fantastic to watch AFL continue to grow and become a true part of the sporting landscape in Sydney and an honour to have played some small part in that," Hall wrote in his column in the Sydney Morning Herald newspaper.

"But when it comes to talk about having a second team in the city, I must admit I have my reservations.

"My opinion isn't swayed by the fact I play for the Swans and a second team would be their direct opposition.

"My playing days will be over by then anyway.

"I just have my doubts that Sydney has enough support for two AFL teams."

Hall is not against the idea of expansion altogether, supporting the addition of a team on the Gold Coast.

The three-time All-Australian also said adding second teams to AFL strongholds of Adelaide and Perth had made sense, but he doesn't believe the culture exists in Sydney to support a second club.

"The Swans have been here 25 years and we've only recently truly established ourselves and much of that has been driven by our on-field success, making the finals five years in a row, winning a premiership and making another grand final.

"Everything is going OK at the moment. We're getting numbers through the gates and the club is finally making money, but in this game you have to be prepared for things to change.

"It's just the way it is with the draft and the salary cap.

"It will obviously get tough and if you have two teams in this city at that time, it will make things so much tougher.

"By the sound of it, it's going to happen regardless of what I think, but I just hope the push for expansion doesn't see some of the good work being undone and see us take a few steps backwards."

The Swans open their season against St Kilda in Melbourne on Saturday.