The 20-year-old is currently on loan at St Andrew's from West Ham United, and Clark believes that the midfielder could further his development with another season at the Championship club.
The former Huddersfield Town boss told the Birmingham Mail: "People might think I'm crazy but I'd like to have another year trying to take Ravel to where he can go.
"That's because he has improved on lots of things, on and off the field. And we believe that if we can get another year with him, we can continue that development.
"The thing for me is that he has shown the willing. I have said all along that there's no doubt about the talent. I think people are seeing that. There's an unbelievable footballer in there."
Morrison, who began his career at Manchester United, has made 25 appearances in the Championship this season.