Injury plagued Sydney FC veteran Brett Emerton is set to announce his immediate retirement from the sport.
It's understood the 34-year-old Sky Blues marquee midfielder has notified the club of his attention to quit.
Emerton has managed just nine appearances so far this season as he battles a worsening back problem which forced him off early in the second half of last weekend's 1-0 derby defeat to the Western Sydney Wanderers.
His decision to walk away mid-season could open the door for Sydney to land Tom Rogic, with the Celtic midfielder's loan deal to Graham Arnold's Vegalta Sendai collapsing on Wednesday.
Rogic, who has made just three appearances for Celtic this season, is desperate for some game time to force his way into Ange Postecoglou's World Cup squad and he would certainly boost the Sky Blues finals hopes.
Emerton will leave the sport as the third-highest capped Socceroos player, having played 94 times for the national team.
He made 247 appearances in the English Premier League with Blackburn Rovers, before returning to the A-League with Sydney FC ahead of the 2011/12 season.