820 ILCS 305/5
However, in any action now pending or hereafter begun to enforce a common law or statutory right to recover damages for negligently causing the injury or death of any employee it is not necessary to allege in the complaint that either the employee or the employer or both were not governed by the provisions of this Act or of any similar Act in force in this or any other State.
Any illegally employed minor or his legal representatives shall, except as hereinafter provided, have the right within 6 months after the time of injury or death, or within 6 months after the appointment of a legal representative, whichever shall be later, to file with the Commission a rejection of his right to the benefits under this Act, in which case such illegally employed minor or his legal representatives shall have the right to pursue his or their common law or statutory remedies to recover damages for such injury or death.
No payment of compensation under this Act shall be made to an illegally employed minor, or his legal representatives, unless such payment and the waiver of his right to reject the benefits of this Act has first been approved by the Commission or any member thereof, and if such payment and the waiver of his right of rejection has been so approved such payment is a bar to a subsequent rejection of the provisions of this Act.
Out of any reimbursement received by the employer pursuant to this Section the employer shall pay his pro rata share of all costs and reasonably necessary expenses in connection with such third-party claim, action or suit and where the services of an attorney at law of the employee or dependents have resulted in or substantially contributed to the procurement by suit, settlement or otherwise of the proceeds out of which the employer is reimbursed, then, in the absence of other agreement, the employer shall pay such attorney 25% of the gross amount of such reimbursement.
If the injured employee or his personal representative agrees to receive compensation from the employer or accept from the employer any payment on account of such compensation, or to institute proceedings to recover the same, the employer may have or claim a lien upon any award, judgment or fund out of which such employee might be compensated from such third party.
In such actions brought by the employee or his personal representative, he shall forthwith notify his employer by personal service or registered mail, of such fact and of the name of the court in which the suit is brought, filing proof thereof in the action. The employer may, at any time thereafter join in the action upon his motion so that all orders of court after hearing and judgment shall be made for his protection. No release or settlement of claim for damages by reason of such injury or death, and no satisfaction of judgment in such proceedings shall be valid without the written consent of both employer and employee or his personal representative, except in the case of the employers, such consent is not required where the employer has been fully indemnified or protected by Court order.
In the event the employee or his personal representative fails to institute a proceeding against such third person at any time prior to 3 months before such action would be barred, the employer may in his own name or in the name of the employee, or his personal representative, commence a proceeding against such other person for the recovery of damages on account of such injury or death to the employee, and out of any amount recovered the employer shall pay over to the injured employee or his personal representatives all sums collected from such other person by judgment or otherwise in excess of the amount of such compensation paid or to be paid under this Act, including amounts paid or to be paid pursuant to paragraph (a) of Section 8 of this Act, and costs, attorney's fees and reasonable expenses as may be incurred by such employer in making such collection or in enforcing such liability.
820 ILCS 305/5