The Black Cats are keen to bring the midfielder back permanently after his successful loan spell last season.
HITC Sport understands Bournemouth midfielder set for move.
The Scottish Premiership side have been linked with pulling off a stunning move for the World Cup winner.
The Belgian has fond memories of the Stadium of Light.
The 32-year-old departed Tondela this summer.
Talks over a new deal have reportedly reached a stalemate between the playmaker and the Premier League side.
The Dutchman is reportedly on the verge of sealing a move to Parkhead.
The player was linked with an exit from Newcastle United this summer.
The Dutchman is keen to see the Everton star flourish after a disappointing summer.
Dominic Ball has joined Rotherham United from Tottenham Hotspur and is looking forward to the game against Aston Villa.
Nottingham Forest midfielder Henri Lansbury is wanted by both Aston Vila and Derby County.
The emergence of Kalvin Phillips and Ronaldo Vieira has certainly eased the pain of Cook's absence.
Leeds have been linked to Fabian Delph.
Manchester City want to keep Leeds target Fabian Delph, but interest in William Carvalho suggests otherwise, while West Brom should pay attention to both developments.
Nottingham Forest owner does not appear keen on re-negotiating failed takeover.
The Algerian is wanted by Everton but a move has been delayed.
Former Leeds United striker Michael Bridges' time at the club was wrecked by injuries.
The Bournemouth player is set for a January exit and Tottenham Hotspur should move quickly.
And even then it will be paid out over 5 years.
Tottenham fans of firm belief Manchester United ace Marcus Rashford is not in Harry Kane's league.