820 ILCS 90/20

A covenant not to compete or a covenant not to solicit is illegal and void unless (1) the employer advises the employee in writing to consult with an attorney before entering into the covenant and (2) the employer provides the employee with a copy of the covenant at least 14 calendar days before the commencement of the employee's employment or the employer provides the employee with at least 14 calendar days to review the covenant. An employer is in compliance with this Section even if the employee voluntarily elects to sign the covenant before the expiration of the 14-day period.