Suffered an injury at work? Learn about the process for reporting work-related injuries in Illinois.Call the police when you get in an accident. Then get an accident report. Illinois law requires that you report any workers' compensation injuries within 45 days of the accident occurring. To request in-home accident and injury care services fill out our request form above or call 224-544-9540. Care must be taken to ensure the investigation is fact finding and not fault finding. Obtaining signed statements as soon as possible following an accident. First, you should always report any workplace injury to your employer as soon as possible. It is best to notify your employer in writing.