"Losing someone like Jamie Carragher was going to leave a massive hole for us in terms of his experience," he told liverpoolfc.com.
"Kolo's experience is going to be really important for us - but not just that. He's someone with a winning mentality.
"There weren't too many available who were better than Kolo Toure. He's played with big clubs, he understands what a winning mentality is about.
"He's a good man as well - he knows what the culture is like at a big club."