Pompey have conceded 10 goals in their last two matches, against Manchester City and Chelsea.
Kanu said: “The gaffer has told us what he wants and it’s down to us to implement it.
“The spirit in the dressing-room is good and we’re talking to each other, wanting to find a solution.
“We want to give the fans something back. We don’t want them to lose confidence in us.
“But I believe on Sunday it’s going to be a good show and we’re going to win. I believe that because everyone is fed up with what is going on.
“It will be a difficult game for us because Spurs are trying to find their feet this season.
“The gaffer is pushing everyone to give their best, and I believe we’ll respond on Sunday – not just for ourselves, but for the supporters, because they have been supporting us with their whole hearts.
“I hope I’ll be involved against Tottenham. As an ex-Arsenal player, I love playing against them!”
