Clark has dropped the Swansea City loanee after Blues first two games.
He said: “Kyle is going to be a massive player for us, a big, big player in this division. One of the best central defenders at this level.
“He’s a big boy, he has got all the physical attributes. Technically he is very good.
“Kyle didn’t play a lot of football last year. And we’re just bringing him up to speed.
“He missed a couple of weeks in pre-season, which we need to get into him as well.
“But I said to Kyle last week when I left him out that he is still going to be one of the main central defenders in the Championship this year.”
For the big stories and the banter follow us on Twitter: @tribalfootball