10 ILCS 5/19A-30

(a) The election authority (i) must use election judges to conduct early voting at an early voting polling place or (ii) must appoint an employee or, if appropriate, designate a municipal clerk, township clerk, or road district clerk to serve as the election official in charge of a polling place for early voting. (b) If the election authority uses an employee or designates a municipal, township, or road district clerk under subsection (a), then the election authority may also appoint as many additional election officials as it deems necessary for the proper conduct of the election.