HITC Sport understands that Black Cats are hopeful of concluding deal.
The former Blues striker is set to return to Montreal later in preseason, despite his old club's desire to bring him back in a coaching role.
The 19-year-old Tottenham youngster still has plenty of love for the Gers.
Garth Crooks believes Dimitri Payet has 'all the creative flair' of Eric Cantona.
The Nottingham Forest winger, on loan at Huddersfield, took to social media as Burnley beat Derby 4-1.
How well did Leeds United's former bosses assess talent?
Nottingham Forest have bid for Matthew Knox - but Swansea City and Queens Park Rangers are also interested.
Tottenham Hotspur won 3-1 against Crystal Palace in the Premier League on Saturday afternoon.
Steve Evans has discussed Leeds' interest in Everton winger Aiden McGeady.
Sheffield Wednesday have reportedly made Brentford winger Alan Judge one of their top targets in January.