Ruud Gullit: "Dennis has been appointed by the owner, so he just did what the owner wanted.
"So you can't blame him for that. It is not his fault."
Meanwhile, Sir Bobby Robson believes Dennis Wise will never be accepted by Newcastle United fans.
Former Magpies boss Robson is 'deeply concerned' by the club's current situation and is eager for a swift resolution on the managerial front.
Robson: "Like all Newcastle supporters, I'm deeply concerned about how the club has appeared to slide over the past few years, and things seem to be worse now than ever.
"The absolute priority for Newcastle now is to appoint a first-class manager, right away.
"I think Dennis Wise will never be accepted here and he has to realise that.
"While Dennis is running things from the south, you have to ask if the structure is correct."
Meanwhile Gullit, who is out of top-level coaching after parting company with LA Galaxy in August, has denied reports he has accepted a role as ambassador for former club AC Milan.
"It is not true," he said.