Career
Gan began playing football for his local club, the Marton Hammers before he signed for the Sutherland Sharks in 2000 when he was twelve years old and came up through their youth grades to make his senior debut for the club in 2008. lieutenant was this debut season that shot Gan to prominence within the local media which brought with it a growing reputation to match. He did not disappoint with dazzling performances week in week out which eventually led him to being crowned the New South Wales Premier League player of the year, taking out the Gold Medal award for the competition.
Sydney Football Club He was signed by Sydney Football Club for their inaugural National Youth League squad ahead of competition from rival A-League clubs.
On 28 November 2008, Gan made his debut for Sydney Football Club against Queensland Roar with a 5-minute cameo where he caught the eye. Gan was given his full senior debut on 13 December against Central Coast Mariners.
He scored his second senior goal against Melbourne Victory with a long range strike from outside the penalty area. Gan scored his third senior goal against Wellington Phoenix with a powerful header from a corner.
He was released from Sydney, along with several other players at the end of Sydney"s 2011 Asian Champions League campaign.
Bonnyrigg White Eagles Gan signed for Bonnyrigg White Eagles in the NSW Premier League, and made his debut in the Round 15 game against Sydney United. Sabah FA On 17 November 2011, Brendan joined the Malaysian club, Sabah FA as one of the two foreign players allowed in the 2012 Malaysia Super League. Brendan, alongside his fellow countrymen, Michael Baird signed a one-year contract with Sabah.
Rockdale City Suns Brendan signed with Rockdale City Suns Football Club NSW Premier League the next season since no contract extension was offered by Sabah.
With this opportunity, he confirmed his intention to return to the A-League. Kelantan FA On November 2013, Brendan returned to Malaysia and signed three years contract with Kelantan FA. He was supposed to be registered as a local player for Kelantan FA but did not get the approval from FAM because FAM any player to be registered as local player required to have Malaysian identity card or passport.
On 6 April,he officially obtained an identity card and registered by Kelantan FA as a local player on April transfer window. He made his debut during the match between Kelantan FA against Terengganu FA which ended with both side had a draw 1–1.
In the first game of the 2015 Malaysia Super League Gan suffered a serious torn Anterior Cruciate Ligament that will keep him out for most of the 2015 season.
Gan has not been capped for either Australia or Malaysia. Gan is eligible to play for Australia as his birth country, while also eligible for Malaysia through parentage. He has decided to play for Malaysia Club Sydney Football Club A-League Premiership: 2009-2010 A-League Championship: 2009-2010 A-League National Youth League: 2008-2009 Sutherland Sharks NSW Premier League Premiers: 2008 NSW Premier League Runner-up: 2008 Bonnyrigg White Eagles Football Club NSW Premier League Premiers: 2012 NSW Premier League: Runner-up 2012 White Eagles Cup: Runner-up 2012 Kelantan FA Malaysia: Runner-up 2015.