The 2-1 reverse meant Sunderland had achieved the double against the Toon this season.
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Asked about his position, Howe said: "I am committed, fully committed. I'm disappointed in myself and my delivery today over the last week. The Barcelona game was very tough. Today is even tougher.
"Yeah, I mean, I always, as I said after the Brentford game, absorb myself and don't look to deflect it to my players, I protect my players to my last breath.
"That is how I look at it. It is going to be a tough painful few days for me."
On the home jeers, Howe added: “We never want to go through a hostile reception from crowd. I understand the criticism.”