Emanuel campaign spokesman Ben LaBolt said Sunday that Clinton will be in Chicago in January to appear on Emanuel's behalf. A date and place have not been determined.
Emanuel formally announced he would run for Chicago mayor in November, just weeks after leaving his post as President Barack Obama's chief of staff. Before his time in the Obama administration, Emanuel spent five years as a U.S. congressman for Illinois.
Emanuel held various positions in the Clinton administration, including senior policy adviser, director of special projects and political director.
Chicago Mayor Richard Daley has said he will not seek a seventh term.