The Ottawa Senators have called a press conference for Sunday morning to make a "significant hockey announcement."

It's believed general manager Bryan Murray has decided to step down and shift into a role as a senior advisor, while assistant Pierre Dorion will become the seventh GM in club history, reports Bruce Garrioch of the Ottawa Citizen.

Murray has served as GM since 2007, taking on the role after coaching the Senators to the Stanley Cup Final that year. The 73-year-old remains in a battle with Stage 4 colon cancer, and has reportedly been considering this move for over a year.

He'll hand the job to Dorion, who's been with the Senators for nine seasons, while another familiar name may have an increased role:

Expectation is that Daniel Alfredsson's responsibilities will also increase. — Ken Warren (@Citizenkwarren) April 10, 2016

An official announcement is set for 11 a.m. ET from Ottawa.