Fuming Peterborough manger Darren Ferguson apologised to his side's fans after they slumped to a 3-0 home defeat by Norwich in the third round of the FA Cup.
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London Road was packed with more than 13,000 fans for the clash between the local rivals but the home supporters had little to cheer as Norwich dominated despite making eight changes to the side beaten by West Ham on Tuesday.
Elliott Bennett opened the scoring in the 30th minute and Simeon Jackson added a second four minutes before half-time.
The expected challenge from Posh never really materialised, with the excellent Robert Snodgrass grabbing a third in the 70th minute, and Ferguson did not mince his words about his side's display.
He said: "We've got our largest crowd of the season and I have to apologise to my own supporters for that performance because we're at home in a cup game which my players, for whatever reason, turned into a pre-season game.
"I'm quite glad it's taken me a while to talk to the press, and I haven't had a meeting with the players yet, because sometimes you can say things you might end up regretting.
"It was a shocking performance. If you've got your first proper tackle after 65 minutes in a cup tie then you're going to lose.
"I can accept people playing badly but the most disappointing thing for me was Norwich looked like they wanted it more, and they were the ones that made a lot of changes.
"I know what I'm going to say to the players. They'll expect me to pick them up again and perhaps they're starting to take that for granted."
The form of the two sides had indicated an upset could be on the cards, with Norwich arriving on a four-match losing streak while Peterborough had won four out of five to climb out of the Championship relegation zone.
Posh were hampered by the loss of three key men in Gaby Zakuani, Lee Tomlin and Dwight Gayle but Ferguson insisted that was no excuse and called for a reaction in next weekend's home clash with Nottingham Forest.
"When you go on a good run and then you've got a cup match and it's a home tie, you think it could be another step towards improving in the season," he said.
"Now we've seen what we've seen today, and it's the easiest game Norwich will have all season. All of a sudden you're back on the back foot, and you've got to go to a hard game like Forest.
"I gave my players two days off so there's no excuses whatsoever. I'm as frustrated as I've been for a while because I didn't see that performance coming.
"They've definitely let the fans down but I think the players have let me down today and they're going to have to give me a response, simple as that."
Norwich manager Chris Hughton hailed the attitude of his players, with Declan Rudd's only save coming in the final minutes of the match.
He said: "Our approach to the game was very good, very professional from the first minute, but of course you need to score goals to give yourself a bit more of a comfortable time.
"I think probably the pivotal time was at half-time because if they get a goal back then it could be a tough afternoon but I thought we were very professional from first to last minute."
Snodgrass, one of only three players retained from the loss to West Ham, was the star of the show, setting up the first goal before applying a clinical finish to a second-half break.
Hughton added: "He's a good player. I made the decision to make some changes. Robert's one that I know can play games, he's a fit lad. I think he just showed the form that he's been showing for us.
"He's been playing consistently and has been adding some goals to his game and assists. But I thought he was part of a really good all-round team performance today."