Del Valle says he doesn't think it's necessary to "play games'' and form an exploratory committee. His spokeswoman said Thursday that more details will come next week.
"I am definitely running. I will do a formal announcement in the near future," he told the Chicago Sun-Times.
Del Valle, 59, was born in Puerto Rico, and came to Chicago with his family at the age of 4. He received a bachelor's and master's degree from Northeastern Illinois University. He later went on to become the first Hispanic Illinois state senator and served a district on Chicago's North Side for nearly two decades.
He became city clerk in 2006.