"I have officially retired. I tried my best to come back from the knee injury but unfortunately that is the end of my career," the midfielder told BBC Radio 4's Today programme.
Jenas began his career at Nottingham Forest, and had spells at Newcastle United, Tottenham Hotspur, Aston Villa and QPR.
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(Reporting by Simon Jennings in Bengaluru; editing by Amlan Chakraborty)
