The Roughriders are coming off a 35-13 loss to Ottawa on Sunday that dropped their record to 0-9. They are the only winless club in the CFL this season and sit in the West Division basement - six points behind the Winnipeg Blue Bombers, who are 3-6.
"We are not meeting our expectations or our standards on the field and these changes were necessary to move us forward,'' said Riders president and CEO Craig Reynolds.
"Brendan and Corey worked tirelessly for this organization and I thank them for all that they have done for our team. But we are in a results oriented business and the current position of our team is unacceptable and this decision was necessary for us to build this team towards sustained success.''
Both vacated positions will be filled on an interim basis with a full search being conducted at seasons end. Jeremy O'Day has been named interim VP of football operations and general manager, while Bob Dyce has been named interim head coach.
Chamblin led Saskatchewan to a Grey Cup in 2013, but this season was a struggle right from Week 1 when starting quarterback Darian Durant went down with a season-ending injury. Veteran back-up Kevin Glenn followed Durant with an injury, leaving rookie Brett Smith at pivot.
Chamblin joined the Riders in 2012 and went 29-34.
CKRM/Sportsnet CFL insider Arash Madani broke the story Monday night and provided the following analysis...
MADANI COMMENTS ON 620 CKRM ON THE FIRINGS
"I think there might some kind of impression that Brendan Taman went down on the sword -- that he was told to fire Chamblin or he'd be out the door as well. However the information I've been given is that that's not the case at all.
"Taman was, at this point, ready to part ways with Chamblin as the coach. He knew he lost the team with how things shook down Sunday in Ottawa and it was time to turn the page. But by that point it was too late. The organization had decided it was time to end their time with the GM and the coach. A GM whose first coaching hire was Corey Chamblin - a coach that brought them a championship - and was not given an opportunity to hire a second head coach. That's what's most puzzling of all."
ON O'DAY AND DYCE
"At this point there was no other option. You're not going to bring in a head coach worth his salt to take over an 0-9 team, to be a dead-man walking, with no quarterback, with no assurances past this year. You had to go internally, you had to find somebody and the show has to go on, not only for Labour Day, the Banjo Bowl and the remainder of the season. That's how things will be moving forward. I'll be surprised if at sometime Jeremy O'Day isn't named the full-time GM in the months ahead but there will be a national search for the next head coach of the Saskatchewan Roughriders."
THE OTTAWA GAME WAS THE LAST STRAW FOR CHAMBLIN
"Totally agree. Corey Chamblin lost his football team in Ottawa with how that all shook down. Going with Tino Sunseri, a guy they weren't even fans of last season, cut in training camp, and you're supposed to be evaluating and developing for the future and you bench Brett Smith because of a sideline altercation in an emotional game? These are supposed to be grown men and grown professionals making intelligent decisions. This wasn't one. While it wasn't the cause of Chamblin's demise, it was definitely the final straw that had him leave midway through this 2015 season."
(With files from the Canadian Press)