Sheffield United midfielder Garry Flitcroft has retired from football because of a knee injury.
Flitcroft made only six appearances for Sheffield United
The 33-year-old joined the Blades on loan from Blackburn Rovers in January this year and was expected to make the move permanent this summer.
But a statement on the United website said they have not taken up the option of extending his contract.
"The club and the player both accept that Flitcroft can no longer participate at the level required."
Manager Neil Warnock said: "This is a blow because Garry's Premiership experience would have been invaluable to us next season.
"The player himself had always maintained that we would see the best of him in August after a full pre-season programme."
In almost a decade at Blackburn he played in almost 250 matches and captained the side who paid Manchester City £3.5m for him in 1996.