Harper has quashed rumours of a fall-out with manager Alan Pardew and insists his "love for the club" means that he is prepared to do any job asked of him.
Harper's love for the club is unquestionable and he stated in the Evening Chronicle: "Of course it is. This is my 19th season as a pro.
"At the start of the season it was obvious the way it was, I had a few chats with the manager and he told me he wanted to bring somebody in with Fraser Forster being on loan, and that may become permanent, who knows?
"It was important to get somebody in. He's got Rob in now and when you are a young lad it is important to get involved as soon as possible.
"I have no problem with the rota system.
"Everybody knows I have a million T-shirts for sitting on the bench."