Nathan Burns

It's easy to forget only three years ago, Burns was the best player in the A-League, winning the 2014-15 Johnny Warren Medal. The 29-year-old's career has stagnated ever since, having left Wellington for Japan, firstly with FC Tokyo and more recently Sanfrecce Hiroshima. Burns left Tokyo after falling out of favour but since his move to Hiroshima in July, he's failed to make one appearance, although injury hasn't helped. Needs to weigh up his priorities in his career right now.

Matt Spiranovic

The central defender would be a first-choice Socceroos starter if he was playing at a higher level at club level, having spent 2017 with China's second division with Hangzhou Greentown where he's on a lucrative contract. Hangzhou missed promotion, so another year in the second tier looms for the 29-year-old who started all three Australia games at the 2014 World Cup. Another one who needs to weigh up his priorities.

Curtis Good

Injuries have cursed the 24-year-old central defender, who made one Socceroos appearance under Postecoglou, shortly prior to the 2014 World Cup. Good endured several years battling a hip injury but has been fit for the past 12 months, playing with Newcastle's reserves and under-age sides. The defender only has six months left on his contract and the Magpies may try cash in, likely with a lower tier English club, having now proved he isn't fragile.