Alan Pardew has warned Premier League clubs that Newcastle are pose a "dangerous" proposition following victory over defending champions Manchester United.
A 1-0 victory at Old Trafford on Saturday goes with triumphs over Tottenham and Chelsea, all of which expected to feature in the title race.
Newcastle also managed to steal a point against second-placed Liverpool earlier in the campaign despite being down to 10 men and Pardew believes his side are showing Premier League quality.
The weekend's win saw Pardew become the first Newcastle manager to prevail at Old Trafford since 1972 and insists the Magpies are able to compete in the top flight.
"It's the top teams we have done well against this year," Pardew told the Newcastle Chronicle.
"Tottenham, Chelsea, Liverpool and now Man United.
"This team were asked to play a very different way and they answered that.
"We can change our tactics and win. We can feel confident to do that. And that makes us dangerous."
Despite victory over United, Newcastle slumped to a 3-0 defeat to Swansea during the week and Pardew acknowledges there are lessons to be learnt.
"We had to eradicate the performance at Swansea," he added. "I must take some blame for that. I must make sure I use all of my squad. I have good players in the background.
"I have to be confident to put them in."
There was a raft of changes from Pardew as he operated with a packed midfield against Manchester United and reaped the rewards as Cheick Tiote, Yohan Cabaye and Vurnon Anita combined to win the midfield battle.
Pardew was reluctant to dwell too much on the South Wales defeat and admits Saturday's victory came some way to making up for it.
"Swansea gave us a kick up the bottom in terms of how to keep possession," he said. "And how to have control.
"We let control go in the week. We made it clear we went there [Old Trafford] to play and to try to win.
"We never even contemplated a draw. There was a real feeling in that dressing room we could win.
"We were outstanding. We defended very, very well and made it very difficult."