The former Socceroo has not played since January 2011, but has been offered the chance to return to fitness - and perhaps push for a contract - at the Sky Blues
The A-League may yet see Jason Culina again, with the former Australia midfielder to train with Sydney FC as he continues his recovery from serious knee injury.
The 32-year-old has not played a competitive match since Australia's Asian Cup match against South Korea in January 2011, but he will take an important step back to football by linking up with the Sky Blues.
There is no indication that the former FC Twente midfielder is a transfer target for Sydney, but Culina - last contracted to the Newcastle Jets in 2011 before his deal was set aside due to his injury - could press for a deal at the A-League club if he can prove his fitness.
Culina has been undertaking a rehabilitation program with Sydney FC physio Stan Ivancic and will continue to work alongside Sky Blues defender Pascal Bosschaart, who is recovering from an Achilles injury.
"Jason has had a terrible injury, he is a great guy and has been a wonderful servant of the Socceroos. As such we want to assist him to get back playing football as soon as possible," Sydney FC football director Gary Cole said.
"Jason is very happy with this position and is looking forward to regaining full fitness.
"Nothing has been discussed further than that."
Leo Karis, agent for the 58-times capped Socceroo, said his client was grateful for the chance to train at the Sky Blues: "It's only natural that I will have a serious conversation with Sydney FC when Jason fully recovers but there is no obligation on either party to enter into an agreement for Jason to play for Sydney FC.
"We thank Sydney FC for their great support."