Williams has dubbed rival derby skipper Craig Bellamy as the best professional he has played with.
He said: "Craig's a really good player and I thought he played well even in his last Wales game against Belgium.
"He's someone I've always looked up to especially as I've had the chance to meet him, know him and can call him my friend.
"He's brilliant and the best professional I've worked with.
"He has obvious qualities and has helped Cardiff have a good start to the season."
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