Ancelotti took charge before Christmas and has big ambitions for the club.
Kelly told the club's website: "Carlo is wonderful to work with, as are the staff around him.
"They are all very engaging and approachable. It's been a great experience.
"Before Carlo came in, I'd read his book and I was telling people, 'You've got to read this book, it's absolutely fantastic'.
"There's so much wisdom in it. You try to take little snippets and think, 'How can I build this into my daily life?'
"Never mind as a coach, but as a person as well. Everything you read about the man is true in life as well."