The former Standard Liege striker rates the youngster among the best prospects in Europe.
"Lukaku? He already has a fantastic reputation in Europe. He scores goals, he's young and he is champion," said Jovanovic.
The Serb also revealed former Standard teammate Steven Defour asks him about life on Merseyside.
"Sometimes I hear something from Steven Defour," he added. "He supports me in Liverpool and I support him now that he is injured."