The BT Sport pundit has made a claim after years watching the pair in Scotland and England.
Everton reportedly wanted Kieran Tierney when he was at Celtic.
The BT Sport pundit thinks Celtic could have squeezed more out of Arsenal in negotiations.
Arsenal’s Kieran Tierney and Andrew Robertson of Liverpool are Scotland international teammates.
The 22-year-old was already a Celtic legend by the time that he left.
Kieran Tierney left Celtic in the summer transfer window.
Neil Lennon’s Celtic won in the Europa League on Thursday evening.
Both Celtic and Arsenal enjoyed success in the Europa League on Thursday night.
Arsenal beat Standard Liege 4-0 on Thursday night.
Kieran Tierney joined Arsenal from Celtic in the summer transfer window.
Tottenham Hotspur youngster Kazaiah Sterling has picked up an injury while out on loan which has proven difficult to diagnose.
Leeds United have welcome a remarkable character to the club, with Simone Farina joining.
Martin Dubravka and Isaac Hayden are important players for Newcastle United.
Sunderland want a coach with a proven League One record after sacking Jack Ross and two-time promotion winner Phil Parkinson ticks that box.
Tottenham Hotspur have endured a very difficult start to the season and Mauricio Pochettino will be hoping for a change in fortune after the international break.
Dele Alli has endured a number of difficult moments in a Tottenham Hotspur shirt as he hopes for a change of fortune in these coming months.
Arsenal have signed Dani Ceballos on loan from Real Madrid, and Unai Emery may well be tempted to make the move permanent.
Mesut Ozil has started only one Premier League game for Arsenal this season as Unai Emery continues to keep him out of his current plans.
David Moyes spent 11 years in the Premier League at Everton but could he really return to Goodison Park?
The Gunners midfield ace has had a superb month for Unai Emery and co.
The Celtic left-back is out of Thursday's game, which could provide his Sheffield Wednesday rival with an unexpected opportunity.
Fulham are reportedly keen on Celtic's Kieran Tierney.
Celtic confirmed their progression to the Europa League despite losing at home to Anderlecht. But who were their best performers? And their worst?