Norwich City's Championship rivals Sunderland and Swansea have dismissed coaches Tony Mowbray and Michael Duff on Monday night.

The managerial casualties were officially announced within an hour of each other, bringing the total in the second tier this season to nine.

David Wagner's own future at Norwich City has been the subject of intense speculation during a prolonged downturn before three wins from the last four.

Wagner publicly revealed he had the backing of the club's soon-to-be joint minority shareholders Delia Smith and Michael Wynn Jones prior to the late comeback win at Cardiff, that marked the end of Stuart Webber's tenure as sporting director.

That ended a run of nine defeats in 12 games in all competitions, which included away losses to Duff's Swansea and Mowbray's Sunderland.

The Black Cats dismissed Mowbray with Sunderland ninth on 27 points, after taking the Wearsiders to the play-offs last season.  

“All at SAFC have thoroughly enjoyed working with Tony and he is quite rightly held in high regard by our players and staff, and our supporters," said sporting director Kristjaan Speakman on Sunderland's official site. "After arriving at an uncertain time, he helped guide us to the Championship play-offs and played an important role in developing our team.

"This was a difficult decision to make, but we remain loyal to our ambition and our strategy, and felt that now was the right moment to take this step.

“We are now focused on identifying the right candidate and we will continue to support our coaching team and players throughout the interim period.”

Meanwhile, Duff had only been in post at Swansea since June, after replacing Southampton-bound Russell Martin.

Swansea had won one of their last eight in the league and sit 18th in the table, five points behind the Canaries.

“This was a very difficult decision and one that was given considerable thought and attention," said Swans' chairman Andy Coleman, speaking to his club's site.

“I acknowledge that there has been a significant amount of change at the club, both on and off the pitch, during Michael’s tenure. I consistently asked for patience as we gave him time to implement his plans and bring the squad together.

“Unfortunately, we have seen neither the results that we expect nor the progress from the squad that we need. I believe it is now in the best interests of Swansea City to make a change of head coach.

“I have the greatest respect for Michael as a person and as a leader. I know how hard he and his staff have worked throughout this season for Swansea City. I want to personally thank Michael, Martin (Paterson, assistant head coach), and their families for the sacrifices they have made on behalf of this club and this city.

“I know that Michael will be successful in his next opportunity and on behalf of the board and the entire club, I wish him and Martin only the best in their future endeavours.

“I understand how important it is to reconnect the leadership of Swansea City football club with its supporters."