Steve McClaren has laid down the law at Newcastle United ahead of Saturday's visit to Selhurst Park.
The club's head coach tore into his players in a heated inquest into the weekend's 3-0 defeat to Leicester City at St James's Park.
McClaren was furious with the attitude and application of some of his team in a game from which few emerged with any credit.
The result left the club a point above the Premier League's relegation zone ahead of the game against Crystal Palace.
And McClaren – who addressed his squad on Monday – made it clear he would not tolerate a repeat of Newcastle's abject performance.
Club legend Alan Shearer labelled it "woeful, embarrassing, hopeless (and) inept" on Match of the Day.
McClaren, without the injured Cheick Tiote for the Palace game, is now considering making changes to his starting XI.