The Black Cats emerged victorious from the Tyne-Wear derby in controversial fashion on Sunday.
Steve McClaren’s men were on top for most of the first-half until Bobby Madley’s controversial decision to award a penalty and send off Fabricio Coloccini turned the game on its head.
Janmaat feels that killed the game and is confident of revenge when the two clubs meet next year.
‘I believe we are much better than them,’ said Janmaat, in quotes published by the Daily Mail.
‘We play them again in a few months (March 19) and then we have to show them.
‘In the first half you could see who wanted to play, who was the better team. And I think in every case of the game we were better.
‘Then we got a red card, it is unbelievable. I don’t like to blame referees but it was a big part of the game because it was not a penalty. A red card was crazy in my opinion. That kills the game.
‘We dominated them. It is disappointing when you lose 3-0 and you don’t deserve it,’ he added.
The Newcastle players may well believe they were the better team but the records will show a 3-0 win for the Black Cats, and McClaren must refocus his team for the upcoming visit of Stoke.
The Magpies have shown clear signs of improvement in recent weeks and would likely have built on their 6-2 win over Norwich with a result on Sunday, were it not for Madley’s decision.
They now face a winnable run of fixtures in which they will look to start racking up the points to put the misery of the Tyne-Wear derby behind them.