20 C.F.R. § 10.507 : Employees' Benefits — OFFICE OF WORKERS' COMPENSATION PROGRAMS, DEPARTMENT OF LABOR — FEDERAL EMPLOYEES' COMPENSATION ACT — CLAIMS FOR COMPENSATION UNDER THE FEDERAL EMPLOYEES' COMPENSATION ACT, AS AMENDED — CONTINUING BENEFITS —EMPLOYER'S RESPONSIBILITIES — How should the employer make an offer of suitable work?

Where the attending physician or OWCP notifies the employer in writing that the employee is partially disabled (that is, the employee can perform some work but not return to the position held at date of injury), the employer should act as follows:

(a) If the employee can perform in a specific alternative position available in the agency, and the employer has advised the employee in writing of the specific duties and physical requirements, the employer shall notify the employee in writing immediately of the date of availability.
(b) If the employee can perform restricted or limited duties, the employer should determine whether such duties are available or whether an existing job can be modified. If so, the employer shall advise the employee in writing of the duties, their physical requirements and availability.
(c) The employer must make any job offer in writing. However, the employer may make a job offer verbally as long as it provides the job offer to the employee in writing within two business days of the verbal job offer.
(d) The offer must include a description of the duties of the position, the physical requirements of those duties, and the date by which the employee is either to return to work or notify the employer of his or her decision to accept or refuse the job offer. The employer must send a complete copy of any job offer to OWCP when it is sent to the employee.

20 C.F.R. § 10.507