The League has started its search for a replacement for Gieschen, who will depart at the end of November after 14 years in the role.
Whereas Gieschen's focus has been squarely on umpiring, his replacement could also oversee both the tribunal and the match review panel, and have a seat on the laws of the game committee.
While Mark Fraser is set to continue as chairman of the MRP, the new national umpires manager could be given the capacity to attend all meetings and provide guidance.
He or she could also attend tribunal hearings alongside the existing panel.
Applications for the job close on November 22.
The exact scope of the role will be determined by AFL football operations manager Mark Evans once an appointment has been made, based on the successful candidate's skill set.
The League is also searching for a new national umpires coach to replace Rowan Sawers, who finished in his role at the end of October.
