Former Blues boss Tony Pulis brings his Stoke side to the south coast for Saturdayâ€™s tea-time kick-off.
And Utaka believes that Pompey must beat the Potters â€“ and aim to take maximum points from all their remaining seven home matches.
He told the club's website: â€śWe have to stay optimistic and try to win all of our games at Fratton Park.
â€śIn fact we will go into every match thinking that we can win and get the points we need. You have to respect your opponents. Stoke are a good side â€“ there's no doubt about that. But we need the points, so we have to do everything we can to win the game.
â€śIt was great to win against Southampton. Any win gives you a lift and can help you to win the next game. The result was beautiful and was just what the fans deserved.
â€śIt was a great atmosphere â€“ games like that are what football is all about. But now we need to build on that â€“ starting with Stoke on Saturday.â€ť