SYDNEY Swans co-captain Kieren Jack says he never considered moving to another club after signing a three-year contract extension on Friday.

Due to become a free agent at the end of this year, Jack's new deal will tie him to the club until the end of 2019.

The 28-year-old is the latest Swans midfielder to re-sign with the club after Dan Hannebery, Luke Parker and this week Harry Cunningham elected to continue their careers in Sydney.

Jack said the scenario of him leaving the Swans never really crossed his mind.

"When you come out of contract you weigh everything up, you think about the possibilities," Jack said.

"You put it in the hands of your manager, you look at alternatives later on down the track. 

"I made it clear I wanted to stay here and I'm thankful that it's been pretty seamless in a way and it's all done now." 

"The Swans are the club that first introduced me to the game of AFL football, it has been a great journey so far and I want to help some success going forward.

"I'm still hopeful and optimistic that there are more things to come. 

"I'm certainly not happy and finished with my career the way it is. I want to continue on. 

The real driver for me is team success and making sure we can emulate that for some of the boys who haven’t achieved it, and making sure that blokes who have, can achieve it again. 

"To look around the locker room there have been some faces that have gone in my time. 

"But to see some of the young guys coming through, and the strength of our reserves at the moment - it's enjoyable and exciting and something I want to be a part of in the future." 

After being taken by the Swans in the 2005 rookie draft, Jack overcame a slow start to his career – he played just two games in his first two years at the club – to become one of the great success stories to come through the system.

He won a best and fairest in 2010, played a starring role in the Swans' 2012 premiership team, and was named All Australian the following season.

Jack missed part of last week's loss to Adelaide with concussion after copping a knock in the first term, but said he was 100 per cent confident that he was ready to face West Coast at the SCG on Saturday afternoon.

The 189-gamer said that players in the modern game were now putting their health before anything else when it came to concussion.

"I think players are now a lot more aware and educated and we need to be there's no doubt. We still don't know the impact that it (concussion) is going to have, if anything, going forward in future years," he said.

"That’s why we put complete trust in the doctors - we listen to them, we do whatever they say and they make the call.

"Ultimately the players always want to go back out there but the doctor now has the ultimate say and we trust that decision. 

"My head is fine. You go through a protocol system now and you've really just got to tick boxes along the way.

"You have a light week and I've been through that and feel good."