A member who is not entitled to receive a workers' compensation supplement for periods during which such member is out of service and receiving workers' compensation benefits, but who is statutorily entitled to receive service credit for all or a portion of the period he or she is out of service and receiving such benefits, shall pay the contributions required in connection for such credit, plus applicable interest, by means of payroll deduction after returning to the employee payroll. Repayment shall be at a rate sufficient to complete payment in a period of time equal to the period being credited in connection with such payment of contributions. In the event that complete repayment is not made prior to commencement of retirement system benefit payments, the amount of outstanding contributions, plus interest, shall be deducted from the initial payment of such retirement system benefits, until all repayment is completed.