Sunderland defender John O'Shea believes that the club's board members need to own up to past mistakes.
The North-East outfit have been plunged into relegation battles over the last three seasons.
"It can't keep being the manager's fault, and we cannot continue to have such a huge turnover of players - 10 or so in, 11 out, season after season," the Sunderland Echo quotes O'Shea as saying.
"There have to be lessons learned if we're to move forward. The club has to admit there are a few things they could learn from and change."
The North-East outfit finished three points above the relegation zone in the 2014-15 season.