The Canaries are on a nine-match unbeaten run in the Premier League, and the 25-year-old believes it is largely thanks to the impact made by Chris Hughton's acquisitions.
He told the club’s official website: “The gaffer has brought in good players this summer in defence, like Sebastien Bassong, Michael Turner, and Javier Garrido – they’re all experienced players who have played in the Premier League before and it’s working well for us.
“They’ve been there, done it, and they know what it takes. Bassong is always talking to me during the games and it’s a great help. Playing in the lower leagues and coming up to the top-flight, I now feel that I’m playing well.
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“We’ve gone on an unbeaten run of ten games, and nobody has really heard about it. I’m sure if another team had done it you would have, but long may it continue - I don’t mind being underdogs as long as we prove everyone wrong on the pitch, which is what we’re doing.”
Despite his side's recent good form, Johnson believes the upcoming league clash with Wigan will prove particularly tough.
He added: “Wigan are a good team, they’re a good passing team and Martinez is a great manager, so it’ll be a good game on Saturday.
“I know Wigan are an established Premier League team, we gave them two good games last year, and it’ll be the same this year.
“We’re a bit more disciplined in the way we play this year, we’re not as open whereas we were a bit gung-ho going for goals last season. We had the motto of you score - we score.
“But this year we’ve tightened up things at the back, we’re more of a unit and conceding less goals, which is a good thing.
“We reflected on the game against Villa and we know we didn’t play right.
“The unbeaten run we went on was down to us all working hard as a team and sticking together, and I don’t think we did that on Tuesday, although Villa did have a good game, but it wasn’t up to our standards.
“We’re putting that behind us and we’ve got to go into the Wigan game and do what we did against Swansea.
“When Manchester United came here we were underdogs and everyone thought we were going to lose, and the same with Arsenal.
“We can beat anyone on our day, and hopefully we can do that again on Saturday.”