And the former Spurs man is determined to continue his improvement.
Kaboul told the Portsmouth News: "I'm only 22 years old, so I have to learn from Sol and Sylvain. I enjoy playing with them every day in training.
"I can only get better learning from people like Tony, Johnny, Sol and Sylvain. I'm playing alongside experienced players and I'm the baby. But I am learning all the time.
"I am a lot fitter now than I was at the start of the season. It was very difficult for me before, when I wasn't fully fit. But I worked hard. I feel stronger and faster now and I will always do my best in the team when I get the chance.
"I'm enjoying myself at Portsmouth. It's a good club, everyone does their job well and it's a really good challenge for me."
Adams said: "I don't see why he can't step up to replace Sol in time.
"He's been absolutely outstanding for us and he's surprised me, but he is a lot fitter than he was. Younes has all the equipment. He's a young boy, but is a fantastic athlete, too - I wish I had a body like that!
"He's athletic, he's quick, he's strong in the air and I think he's got it all there to be a big player for us."