Morrison, on-loan from West Ham United, spent time at Brum last season.
Clark said: "He is the best footballer since Paul Gascoigne.
"If Paul Gascoigne had not done his knee he would have become the best player in the world.
"I played with Paul. I grew up with Paul. The only thing is that Ravel doesn't know who Paul Gascoigne is!
"He has the pace of a wide-man. He has the balance but plays in the middle of the pitch because he can manoeuvre the ball.
"Ravel can score goals as we have seen. It is what is between the ears with him and he knows about this problem.
"He now has a perfect manager because Harry Redknapp loves those type of players.
"Ravel can change games and I thought he was a class act against Birmingham.
"I was hoping that he would continue doing it for West Ham because I would love to see him on that plane to Brazil. He would certainly be capable of doing something for England coming off the bench for ten minutes in any environment."
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