The German international looked distraught as he hobbled off after an hour of his comeback match against West Ham in the Carling Cup on Wednesday night.
That was his first start since the serious thigh injury he sustained on Boxing Day last year.
Caretaker boss David, who described the injury as 'a great shame' for the player, at least had this good news.
"The longer-term diagnosis is that we don't believe it will necessitate an operation but at the moment we won't be putting a time on when he'll return.
"It's great shame for Christian. He's been out a long time and hasn't looked to rush back. He played three reserve games and played very steadily, very sensibly.
"I've been quite impressed with him, talking to him while he's been injured. We'll have to see. I'm sure he's had his ups and downs in his career, various injuries, but he's been tested in the last year, that's for sure."
Listen to David run through the team news by clicking the audio link above...
David Pleat revealed this afternoon that Christian Ziege is not expected to require surgery on his damaged knee.