Sigmund joined the club at the start of the 2008/09 season and has played 174 A-League matches, behind only fellow defenders Andrew Durante and Manny Muscat on the Phoenix's all-time appearance list.
Sigmund was named the Phoenix's Player of the Year for the 2010/11 season and the following season he not only became the first player to win back-to-back Player of the Year awards, but also won the media, supporters', and player's player of the year prizes, too.
In September last year, Sigmund called time on his international career as he looked to extend his time in a Phoenix shirt.
He played 32 full internationals for New Zealand, most recently against Japan in March 2014 and was part of the All Whites squad at the 2010 World Cup in South Africa.
"It is a wrench when you decide it is time to hang up the boots," Sigmund said. "I just know the end of the season is the right time because I'm not just struggling physically; I am mentally tired as well.
"I look at the kids and want to take them swimming or to the beach at weekends. Now I will have that chance and the thought of it will keep me going for the rest of the season.
"I've tried to give 120 per cent every time I've taken the field and that won't change. I am determined to get fully fit and get back into the side at some point."Sigmund has struggled with injuries this season (concussion and hamstring) and will be missing again tomorrow when the Phoenix host Sydney FC.
Jeffrey Sarpong will be given another chance to prove his worth and will replace Alex Rufer in the starting line-up. Tom Doyle will also return from the bout of food poisoning which ruled him out of the last game to regain his place at left-back.
Sarpong hasn't started a game for a month but that will change tomorrow night when he joins the red-hot trio of Roy Krishna, Roly Bonevacia and Michael McGlinchey in a four-pronged attacking quartet.
Coach Ernie Merrick said his side will bring a positive mindset to the round 11 clash.
"We're not going to sit back," he said. "Last time we were at Westpac we scored four cracking goals and the thirteen thousand people there really enjoyed themselves. We want to entertain and we want to score goals. I would rather go with another attacking player than go with another midfielder."
Sigmund will watch from the stands, something he will have to get used to next season, but has already prepared well for the next part of his life. He's keen to mentor players at the Phoenix and help advise on careers when they finish.
"I have spent the last three or four years up skilling myself, including doing a life coaching course," he said. "I've gone to different sporting bodies, including the rugby union, finding out what is needed and I am just about ready to set up a business at the end of the season.
"I have loved every moment of my sporting career and will have no regrets when it is over."It's how he played the game.
