Date of birth: 1 February 1989 (30 years old)
Caps: 116
Debut: Friendly v China on 19 June 2006 in Shanghai, China (2-0 loss)
Clubs played for: Brisbane Toro, Queensland Lions, Queensland Academy of Sport, Brisbane Roar, INAC Kobe Leonessa (JPN), Portland Thorns (USA), Houston Dash (USA)
Previous World Cups: 2007, 2011, 2015
Her 2019 so far:
One of the most experienced of Ante Milicic's squad, France 2019 will see the Brisbane Roar and Houston Dash defender contest her fourth World Cup, alongside goalkeeper Lydia Williams and forward Lisa De Vanna.
Polkinghorne once again proved her worth for Roar in 2018/19, providing a steady presence at the back during a Westfield W-League campaign that saw them finish second on the ladder.
The 30-year-old made 13 starts, pulled off 20 tackles and made 31 interceptions as the Roar finished above eventual Grand Finalists Sydney FC and Perth Glory.
While principally a defender, she has found the net on nine occasions for the Westfield Matildas, with her most recent strike earning the team a 1-1 draw with fellow World Cup hopefuls England in a friendly at Craven Cottage, London, in October 2018.