Ferdinand made the claim in a social media Q&A.
“Prime Van Dijk or prime Vidic? Ooooh, good question!
“I've got to go with Vidic because he was my partner, man. He was my partner. He covered my back and I covered his. That was it.
“'I love Van Dijk, don't get me wrong. I love him. Best defender in the world now, definitely.
“I'd love to have seen him play in our time, seen what he was about. That would have been interesting. But top player."