Longmire is now locked in at the helm of the Swans until the end of 2017, giving him the longest job security amongst the 18 AFL senior coaches.

Longmire, 43, took over the mantle at the Swans after replacing the retiring Paul Roos at the end of 2010, under whom Longmire had served as a deputy for nine seasons. In just his second year in charge he became a premiership coach as his side defied the odds to defeat Hawthorn in the grand final.

Newly appointed Sydney chairman Andrew Pridham was glowing in his praise of Longmire, who has won 48 of his 75 games in charge.

"John has proven an outstanding senior coach since taking on the role in 2011," Pridham said.

“His work with the playing group and vision for our team is second to none.

"On and off the field, the club is in great shape, and shoring up John's future at until 2017 is another great step forward."

Should Longmire see out his contract, he would rise to third in the all-time games coached tally at the club, behind only Roos (202 games) and Rodney Eade (152 games).

Swans chief executive Andrew Ireland outlined the importance of having leadership stability in ensuring long-term success.

"The club believes that having an eye for the future is equally as important as the here and now," Ireland said.

"So having John commit to at least the end of 2017 gives him and [football manager] Dean Moore the opportunity to build the football department for not only this season, but seasons to come.

“John is an incredibly hard-working coach who has overseen finals campaigns in each of his three seasons in charge.

“This is a strong and united playing group that continually sets high standards for themselves and much of that is owed to John’s leadership."

The Swans have not been averse to long-term contracts in recent times, handing star recruit Lance Franklin a nine-year deal late last year which is set to expire in 2021, by which time Franklin will be 36.