During his spell at QPR, the 32-year-old suffered a ruptured anterior cruciate ligament in April 2014 and has not played since then.
The former Tottenham Hotspur midfielder, who is currently working as a pundit for BBC Sport, has not given up hopes of playing again.
"I ruptured my anterior cruciate ligament a year ago, and I'd been doing my rehab at Queens Park Rangers to get it back to a place where I wanted it to be,” Jenas told TheFA.com.
"But it's not getting there at the minute, so I'm not in a great place when it comes to being able to play football. I'll just have to take the advice of my surgeon and see where things go from there.”
Jenas has earned a good reputation as a pundit, and it is heartening to see a footballer who struggled with injuries towards the end of his contract with a club still able to remain part of the game.
Having been out of action for over a year, the former England international is not going to find it easy to get a club when - and if - he recovers.
The midfielder will also need a considerable period of time to get in the grove, and one wonders how many Premier League or Championship clubs will be willing to afford him that.