Television pictures showed the Dutchman's exchange with Defoe as they left the pitch at half-time, although Krul later insisted the images had been misinterpreted amid criticism on social
Krul told the broadcaster: "What I actually thought I probably can't repeat on television because it wasn't nice.
"It was a fantastic goal and everyone accepts that. What I actually thought was more in the region of, 'What a lucky guy he is,' but with a bit more venom behind it.
"Listen, I've been at this club for 10 years and I'm as hurt as anybody else, so whoever wants to put this negative light on me, it's not justified.
"I'm a Geordie. I've been here 10 years and I'm going home with a lot of pain in my heart. To see those travelling fans going back to Newcastle without a win again, it hurts me as much as them."