Australia midfielder Mark Bresciano conceded on Saturday that he has probably played the last FIFA World Cup match of his career.
Bresciano, who arrived in Brazil with a persistent back problem, has started Australia's first two games in Group B but looks likely to miss out against Spain on Monday due to a hip injury, which is connected to his back issues.
The veteran midfielder and his long-time teammate Tim Cahill claimed the record of most appearances at World Cup finals for Australia, with eight, when they lined up in their country's 3-2 loss to the Netherlands.
But Bresciano admitted at Australia's base in Vitoria that he may miss out on moving ahead of Cahill, who will miss the Spain match through suspension.
"It's not looking too good. I'm very disappointed," he told FIFA.com.
"Leading up to the World Cup, I was struggling with my back and we've done everything possible to get it right. The medical staff have been brilliant and got me back on my feet.
"But when you have injuries, other problems start arising and it's hard to carry through the games. I didn't feel 100 per cent against the Dutch and things have been steadily progressing. We're still going to try do everything possible but it looks like I could miss out."
Looking back on his experiences at World Cups, Bresciano still ranks the 2-2 draw with Croatia that sent Australia into the round of 16 at Germany 2006 as his favourite memory.
"The best moment of all was probably the game against Croatia, when Harry Kewell scored that goal to equalise, knowing that we were going to go through to the next stage," Bresciano said.
"You know what though? I haven't ever watched the game back. I'm pretty sure I'm the one who crossed the ball into the box for the goal. I'm not sure what happened - maybe there was a little scuffle in the box or something - but it landed on Harry's foot and he just put it away."
Have you signed up to receive Socceroos Insider – Daily?
Sign up now to receive our daily newsletter, delivered at 12pm AEST each day, featuring all the best news and videos direct from camp in Vitoria Brazil.
For exclusive Socceroo videos from inside the camp in Brazil, head to http://www.socceroos.com.au/videos
And don't forget to get social with the Socceroos
Socceroos Spotlight: Luongo, Behich take staggering stats into Norway friendly
Bert van Marwijk will be blessed with the arrival of several in-form stars as his squad assembles in Oslo for the first of two friendlies. AFC Asian Cup winners Massimo Luongo and Aziz Behich are among those at the peak of their powers for the new Caltex Socceroos' coach's fir
Risdon driven by World Cup ambition amid 'competitive' Caltex Socceroos camp
Caltex Socceroos right-back Josh Risdon is braced for an intense training standard as he seeks to realise his boyhood dream of FIFA World Cup selection. Risdon is in contention to add to his five international caps when Australia take on Norway in Oslo on Saturday morning (AED
Fit and firing Behich sets sights on twin Caltex Socceroos wins
Caltex Socceroos full-back Aziz Behich is taking career-best form into what he hopes will be back-to-back wins at the beginning of Bert van Marwijk's tenure. Australia's 26-man squad have assembled in Oslo ahead of Van Marwijk's first match in charge against Norway on Saturday
Norway v Caltex Socceroos: 4 key match ups
Bert van Marwijk’s first match in charge as Caltex Socceroos boss sees his side take on tricky European outfit Norway at the Ullevaal Stadion on Saturday, March 24 (AEDT). With a chance for his players to stake a claim for a spot on the plane to Russia in June, it’s an importa