Manchester City midfielder Fernando has no doubt he can be a key player for manager Manuel Pellegrini's team.
He said: "Manchester City are already a very attacking team with great players, attacking players.
"But given that I have a very strong defensive game, that is going to help us a lot because obviously teams will take advantage of City being so attacking, on the counter-attack.
"I'm going to add very good value in that sense.
"The nickname is something the Porto fans gave to me because I used to steal the ball quite a lot from other players, it was as if I had a lot of legs!
"There are some great players here. But every day that goes on I have to work hard in order to get my spot. I know my strengths and will work hard to make sure I'm first choice."
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