AS Roma have been linked with Santon this summer.
"I'm really good," he told calciomercato.com. "I have recovered from a knee injury and now I'm facing the pre-season with Newcastle at my best.
"I am fine here, now I know what the coach wants and I'm ready to play a great season. I think we can fight for a place in the next Champions League, it's hard but we can do it.
"I left Inter Milan because I was not playing and I needed my space to grow and now I'm delighted to wear the Newcastle shirt.
"AS Roma wanted me but Newcastle replied that I was not for sale and I am glad of this."