The Blues centre-half limped off the pitch during Saturday's defeat against Huddersfield after badly twisting his ankle whilst attempting a shot.
The injury looked serious at the time, and there were fears that it was worse than it has subsequently proven.
"The injury is not as bad as we first feared," said Blues boss Lee Clark.
"To be fair to Curtis when he had his injury he was showing a bit of courage. He was pushing forward as he was trying to make something happen from the back by doing a bit of good work on the ball and then getting into the box
“Having seen the footage he could easily have dislocated or broken his ankle. But as it turns out it is just swollen and there is a good chance of him being fit for the Leicester game."
Meanwhile James Hurst has reported back fit for training after being substituted in the second half against The Terriers because of cramp in both legs.
"It was just cramp and James is absolutely fine now," said Clark.