Sunderland brought in Lamine Kone, Wahbi Khazri and Jan Kirchhoff during the January transfer window.
Kone, Khazri and Kirchhoff were all identified as players who could aid Sunderland in their survival fight by Sam Allardyce during his first transfer window in charge, and all three have made great impression at the Stadium of Light.
The trio have all featured regularly, and they have helped Sunderland improve their performances considerably.
Kaboul has formed an excellent partnership with Kone in the heart of Sunderland’s defence.
And the Frenchman said: “Lamine looks like he’s always been around. He’s a machine, he’s definitely a machine, but he’s very calm also.
“Him, Wahbi and Jan have brought something into the team in the winter.”
Kone, Kirchhoff and Khazri have helped Sunderland climb out of the relegation and into 17th place, with just four matches remaining in their season.
The Black Cats are currently one point above the relegation zone, and they will be looking to protect this position over the coming weeks, with Newcastle United and Norwich City both hot on their heels.
Sunderland still have matches against Stoke City, Chelsea, Everton and Watford to play this season.