Ill. Admin. Code tit. 44, § 8.2075
c) The following procedures will govern the resolution of protests received by the CPO that are covered under this Subpart:
2) Subject of the Protest. A protest may be filed during any phase of the solicitation and award process for a particular contract.
3) Filing a Protest. All protests shall be in writing and filed with the Chief Procurement Officer within 14 days after the protester knows or should have known of the facts giving rise to the protest.
B) The protest shall be contained in an envelope clearly labeled "Protest". The written protest shall include, at a minimum, the following requirements:
8) Decision. A decision on a protest will be made as expeditiously as possible after receiving all relevant information.