Kitson and Liam Lawrence joined Pompey as part of the deal that saw Marc Wilson move to Stoke, and Hughes is looking forward to playing with the former Reading forward after the international break.
Hughes told his club's official website: "He's a quality player. Every time I've played against him it hasn't been an enjoyable experience.
"He holds the ball up well and is a very clever player. He's really good with his back to goal and he scores a few as well. He'll be a good asset for us.
"The international break can give the new boys a bit of time to settle, so in that sense it's come at a good time."