David Moyes' ninth signing of the summer has revealed his admiration for top-scorer Defoe, who has scored twice in three Premier League games this season.
"I was speaking to JD before; everyone knows he's such a great player," said Anichebe.
"We played against Sunderland last season and I was watching from the side, just watching Defoe, his movement.
"He is so strong for a small guy and you know when he gets a chance he's either going to hit the target or score.
"I told him that he's one of the reasons I came here because I feel I can learn a lot from him.
"Even though I'm 28, you can always learn, there's always time for that.
"That's what I'm coming here for and I will give my all because I know what a great opportunity I have here.
"I will try to help the football club as much as I can."