The 25-year-old full-back played the full 90 minutes of the 1-0 derby defeat at the Stadium of Light despite suffering a suspected tear in his calf muscle during the warm-up, but was unable to prevent the Black Cats running out winners as Newcastle slipped to a record fifth successive defeat in the fixture.
Newcastle created little of note on another poor day for John Carver’s men, and Janmaat was pulling no punches as he assessed the fall-out.
“It was not good enough. The first half was really poor, we were too negative, so it was not good enough. The second half was much better, but it still wasn’t good enough,??? Janmaat told NUFCTV.
“I wouldn’t say we didn’t give everything. What I can say is we were not good enough and everybody saw that Sunderland were better, especially in the first half.
“If you are not good enough, then most of the time, you lose.”
Sunderland looked the better side from the start as they collected their fifth straight win over Newcastle, and the first derby win for new head coach Dick Advocaat.
Jermain Defoe???s stunning goal was the difference,?? a first-half stoppage-time volley the only goal for the match.
“A goal in the last minute of the first half, it’s always hard to concede it because you go into the dressing room with a bad feeling.
???If you go in at 0-0, you can be positive in the dressing room, but if you concede a goal in the 47th minute, then it’s hard.
“But they deserved to score in the first half because they had maybe 20 free-kicks and they were better than us, then normally you score a goal. Like I said, it was not good enough.”
Newcastle fans have now endured their team losing 17 of the 21 points on offer in the last seven derby encounters.