Quinn is a Chicago Democrat facing a re-election challenge from Republican Bruce Rauner of Winnetka.
It's a hotly-contested race, and several high-profile leaders from both parties have visited Illinois.
Republican New Jersey governor Chris Christie has traveled to Illinois several times for Rauner, including Friday. Top Democrats have campaigned for Quinn. President Barack Obama is expected back in Chicago for a Sunday rally.
Quinn's campaign confirmed the Clinton event is in Chicago, but offered no date or other details.
Quinn told reporters Friday that he and Clinton share an alma mater, Georgetown University. He says Clinton will talk about what they learned there about growing an economy by investing in people and 'taking care of everyone."
