Bristol City face being without captain Louis Carey for an extended period after scans revealed the defender has a torn calf muscle.
Carey took a kick on the calf during the defeat at Leeds on November 13 and was expected to return to action against Derby this weekend but after suffering further discomfort during training a scan has revealed a much more serious injury than first thought.
"Louis has no chance for the Derby game and I'm not even considering him," Millen told the Bristol Evening Post.
"He did a training session the Monday before last and complained of discomfort in his calf after he had finished. We sent him to hospital for a scan as a precaution and were surprised when it showed up a tear in the muscle.
"Having thought he would be out for two to three weeks, we've now had to revise the date for his comeback."
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