De Zerbi was named OM coach last week.
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He said on Saturday: "If I hadn't found an offer that stimulated me I would have been without a bench for a year.
"There have been contacts with important teams yes, but for various reasons we have not found an agreement.
"It is a place that has always fascinated me, when I was little I admired great players like Rudi Völler and Chris Waddle.
"They are very warm and passionate fans like me."