The Bluebirds striker, on loan at Spurs in 2008-09, said: "When you are a newly-promoted team you maybe worry about playing the big sides.
"But a result like we had against City changes the thinking. It makes you feel that you deserve to be in the league and you can manage against these bigger teams.
"We now have that belief. We've put on two good performances at home and we know we can do it against Tottenham too."