Johnson admits it was a horror show at the Etihad.
"It was one of those games where nothing went our way," he told the Pink 'Un. "Manchester City are top class and always looked like they were going to score but some of the goals we conceded were because we were not up to scratch.
"Looking up at the clock and seeing we were 4-0 down after about 30 minutes, I just wanted a hole to open up so I could jump in it, but we had a duty to each other and to the fans to work hard.
"The dressing room was silent afterwards and no-one said anything jokey because we were so disappointed; it was the worst game I've ever been involved in and for most of the lads it was the same."
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