Rangers parted ways with manager Mark Warburton on Friday.
Everton are reportedly interested in signing Manchester United winger Memphis Depay.
Dick Advocaat thinks Sunderland could benefit from relegation, citing Newcastle United as a template.
Sunderland have had a familiar start to this season under different management but are the numbers similar?
Advocaat spent three-and-a-half years at Ibrox.
The Dutchman is said to be eager to recruit the Sunderland midfielder for the second time in just over 12 months.
The Italian international wants a move to Bologna.
Sunderland secured their Premier League survival with a win over Everton on Wednesday.
He endured a controversial time at Rangers, but Lorenzo Amoruso turned things around to win the treble at Ibrox before his departure.
He was last seen at Rangers as a manager, but during his playing days, Stuart McCall played a major part in the club's dominance during the nineties.