Tottenham Hotspur manager Mauricio Pochettino admits he has no idea when Kyle Walker will return to first team action.
Walker has not played for Spurs since March having also missed the World Cup with an abdominal problem for which he underwent surgery last month.
The club were unable to narrow down a return date for the full-back following confirmation of the surgical procedure in September, and Pochettino admits they are still unsure when the player will be fit to return to first team action as he approaches eight months on the sidelines.
"At the moment it is impossible to give you the date," Pochettino told reporters when quizzed on Walker.
"It is a good recovery at the moment. We are happy, but it is impossible to predict the time, when he is maybe ready to train with the team and to start to play."
Uncertainty surrounding Walker's return date has raised the question of DeAndre Yedlin possibly arriving at White Hart Lane earlier than planned.
Spurs struck a deal with Seattle Sounders to sign the 21-year-old full-back for £4m in the summer but allowed the player to remain at the MLS club for the remainder of the current campaign and the opening months of next season, before he joins up with Spurs ahead of the start of the 2015/16 season.
Pochettino has refused to rule out the United States international's arrival in January as cover for Walker. "It is not a moment to decide as we need to wait for the evolution of Kyle's situation," Pochettino added.
"We need to give time for Kyle to recover from injury. We have time to decide but it is impossible now to make a decision now."
Tottenham continue their Europa League campaign on Thursday against Besiktas at White Hart Lane