Saturday's 3-0 derby defeat at St James' Park was the second in succession the Magpies have suffered at the hands of their arch-rivals.
The 27-year-old said: "All I can say to them [the fans] is sorry for this defeat again because we cannot accept that.
"It's two seasons now we have been beaten by Sunderland at home and this is the worst, worst thing in my career, so I just want to say sorry to them.
"That's football, we need to focus on the next game now."
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