Gullit was speaking ahead of tonight's derby, which could see Inter Milan crowned as Italian champions.
He told La Gazzetta dello Sport: "At Milan they would have preferred a different match, let's say not a decisive one, but given the situation I'm sure they will do everything not to lose.
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"Inter cannot celebrate the championship in a derby at Milan's home! Having said that we must admit that the Inter are playing very well and not from today: they are favourites to win this evening, that's how it is."
On Pioli, he continued: "He did a great job.
"I don't know, I'm reading things. But I think he did a great job at Milan."