Posh players received the wrath of Darren Ferguson after a first-half which the manager described as undefendable.
Posh conceded three times in the opening 45 minutes against MK Dons on Saturday (February 21) with Ferguson hauling off Michael Smith and Erhun Oztumer in disgust before the break.
However, Ferguson admitted that he could have taken his pick of players to replace after seeing Will Grigg and Ben Reeves strike, before Reeves grabbed a third on the stroke of half-time.
“Sometimes performences are undefendable. That was certainly the case in the first-half,” said Ferguson.
“The goals we lost were awful. It could have been more really.
“I just felt that every second ball, every header, every tackle were won by Milton Keynes which is unusual in a game like this.
“I can’t really defend that 45 minutes.
“In the last eight years we have been a success story, but we’re just not at that level.
“If we had performed like our fans today we would have won comfortably.
“The fans were absolutely magnificent and we owe them an apology. That’s not acceptable.
“It’s a big job to get back to where we were, but it’s a job I want to do.
“I’m as enthusiastic as the day I walked in.
“Sometimes as a manager you have to put on different faces, you rein yourself in because you have to be careful with the players, but not today. The players got the truth.”
Ferguson decided to switch to a back-four for the match as he believed it was a formation which works well against the Dons.
He also said he can’t keep going to chairman Darragh MacAnthony for more players every time the team underperforms.
On the decision to take off Oztumer, which led to some boos from the big away continent, Ferguson added: “It could have been all of them. I could only make three subs.
“If I could have made more I would have. It just wasn’t acceptable the first-half.
“As much as I like Erhun as a player, he had one shot on goal and did not influence the play like I wanted.
“Both players to come off are unfortunate. It could have been any one of them.
“Second-half we were better, but it couldn’t have got any worse.
“This is the worst game we’ve had against this lot.”