Advocaat revealed the news to Dutch football magazine Voetbal International on Monday, just hours after Poyet was relieved of his duties following Sunderland's 4-0 Premier League drubbing at the hands of Aston Villa over the weekend.
The 67-year-old Dutchman, who spent four months as head coach of the Serbia national team last year, told VI: "I am now in a dark hotel, but soon I'll be working in the Stadium of Light."
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