John was invited to become an academy ambassador in 2008.
John has had an exciting career as a goalkeeper over the years. He played for St. George Saints and Wollongong Wolves in the old National Soccer League in Australia before moving to England to join Cambridge United in 1993. In 1995 he signed for Coventry City, and then moved on to Blackburn Rovers in 1997.
He joined Wigan Athletic in December 2001 prior to the start of Wigan's debut season in the Premier League. He missed only one match for the club but was injured at the start of the 2005–06 season with Wigan's new signing Mike Pollitt taking his place in the side. Filan signed a new contract, which kept him at the club until 2007. Seeing out his contract with Wigan, he was released at the end of the season. Whilst at Wigan, he appeared as a substitute in the 2006 Football League Cup Final when Pollitt had to come off early in the first half with an injury. Filan then returned to Australia in semi-retirement, resettling in his home town of Sydney.
Once settled back in Australia, John joined the coaching staff at Sydney FC and worked alongside IGA Director of Coaching, Jim Fraser, as a goalkeeping coach.