Caldwell will partner Bosnian international defender Mohammed Konjic and the Scottish international says he is looking forward to playing alongside him.
"I have heard a lot about Mo and I am very much looking forward to playing alongside such a powerful and experienced guy, and I am sure I will learn a great deal from him," he explained.
"I like to win the ball and pass it. I keep things simple and like to play the ball out from the back rather than boot it up field, and I am sure Gary (McCallister - Coventry manager) wants the game to be played that way."