"They've not broken any rules," said the former Stoke manager.
"If it's within the rules, as long as they're not breaking any rules they're entitled to do what they want. I think Roberto has been clever.
"Do I think certain rules are right? There are certain rules I think are absolutely crazy, but they are the rules and you abide by them.
"Everybody knows them, they are set out.
"I think the important thing is that if Roberto had broken the rules then you could talk about it, but the rules are there for everybody to use.
"And if he's used them, and he's used it to his benefit and Everton's benefit then fair play to him."
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