A pre-contract has already been agreed - but the Scottish champions are keen to bring back their former star in this window

Tierney is set to leave Arsenal for Celtic, be that now or in the summer, and Chris Sutton has now shared his reaction to this news. Sutton reacted to the news about Tierney returning to Celtic on social media. Sutton, of course, has a soft spot for Celtic having played for the club during his career.

Celtic have agreed to a deal to re-sign defender Kieran Tierney from Premier League side Arsenal and are trying to get the transfer over the line by the end of the January transfer window, manager Brendan Rodgers said.