The former Reading and West Bromwich Albion chief could join Celtic after a year out of work.
Sheffield United are said to have wanted the Southampton striker ahead of the January transfer window.
Shane Long scored the fastest goal in Premier League history as Ralph Hasenhuttl's Saints drew with Watford on Tuesday.
Saints ace Long, now holder of the quickest Premier League goal, joins another exclusive club featuring Niall Quinn, Robbie Keane and Damien Duff.
Southampton were the better side for much of their Premier League clash at Watford with Shane Long breaking a top flight record.
The Saints striker netted after 7.69 seconds against Watford.
Shane Long scored for Southampton against Liverpool last Friday.
The Saints forward has scored just three goals in the past two seasons.
The former Republic of Ireland manager is expected to be named Aitor Karanka's successor.
The Southampton striker has been woefully impotent on front of goal over the past couple of years.
Clarke Oduor quit Leeds United on transfer deadline day.
Danny Rose still has a role to play at Tottenham Hotspur it seems.
Josh Onomah is back in the Championship with Fulham after Tottenham Hotspur used him in an exchange for Ryan Sessegnon.
The Liverpool right-back picked up his first assist of the season last night.
Eros Grezda is dead and buried at Ibrox side Glasgow Rangers, but will he be staying nonetheless?
Steven Gerrard’s Glasgow Rangers are on the verge of signing reported Celtic target Brandon Barker.
Arsenal and Chelsea were involved in some late transfer drama on deadline day.
Tottenham Hotspur boss Mauricio Pochettino decided to turn down two Watford offers for Danny Rose.
Tottenham Hotspur managed to complete the signing of Giovani Lo Celso from Real Betis on deadline day.
De Bock has only played seven times for Leeds United.