Polias has made 157 W-League appearances, including winning two championships and two premierships.

The 31-year-old has also played in seven grand finals - and led Sydney FC to five of the past six deciders.

"I love playing football and I love playing and representing Sydney FC," Polias said in a statement.

"But I feel now is the right time to take a break and concentrate on starting a family.

"This is such an exciting time in our family's lives and I am looking forward to becoming a mother and enjoying that time."

Polias emphasised she had not retired from football at this stage but would make a decision on her future at a later date.

"I'm not retiring from football, but I want to take this moment to experience and dedicate my life to others after 13 fabulous years playing this game," she said.

"When the time is right, I'll make a decision on my playing future."

Polias has also made 12 appearances for the Matildas, including at the 2015 Women's World Cup.

She started her W-League career at Central Coast in 2008, playing two seasons for the Mariners before joining Sydney FC.

Polias became the Sky Blues' first 10-year W-League player last year and has played 145 W-League games for Sydney, including a record 18 finals appearances.

Australian Associated Press