Taleo requisition approval can we delegate at a user level another user?

Summary

Taleo requisition approval can we delegate at a user level another user?

Content

Hello,

One of the approvers in the requisition approvals flow, an employee is leaving .
We will update the requisition approvals flow accordingly , with another employee who replaces him.
In the meantime - How can we delegate to have instead of a user ANOTHER user to approve all his requisition approvals requests at the user level ? (and not enter each flow)

Thanks 
Revital.