He told the Sunderland Echo: “It is not to re-establish myself, it is just to prove to some of the people that they were wrong (about me).
“I will work hard to show they were wrong over the past few years.
“Part of my mentality is to never give up, even if something goes a bit wrong you always have to keep working – that is what I have been doing.
“Now I have the chance to prove myself again."
He added: “I spoke with the manager and he asked me if I wanted to come here, I said that I wanted to play football.
“He gave me the opportunity to do that. I am really thankful for that.
“He is building a very good team here.
“It is still early for him to show people what he can do, he needs time to adapt to the club, of course.
“But I think he is doing very, very well and all of the players that have been signed are all very good players."