Liverpool star Andrew Robertson and Celtic ace Kieran Tierney are Scotland international teammates.
Celtic's centre-back issues are well documented, but what about either side of the heart of defence?
Celtic striker Moussa Dembele has been linked with Everton, West Ham United and Brighton and Hove Albion in the January transfer window.
Celtic's Kieran Tierney suggests he might never leave Parkhead.
If Manchester United focus on Fulham's Ryan Sessegnon should Tottenham turn attention back to Kieran Tierney of Celtic?
Manchester United are reportedly more interested in Celtic's Kieran Tierney due to Luke Shaw's recent improvement.
Everton fans have been alerted to the potential of Celtic's Kieran Tierney.
Moussa Dembele has been linked with moves away from Celtic in the January transfer window.
The Celtic defender was rusty against Rangers and would benefit from a short spell out of the side.
The Celtic left-back has already scored three goals this season.
Celtic confirmed their progression to the Europa League despite losing at home to Anderlecht. But who were their best performers? And their worst?
The England support drew unfavourable comparisons between their oldest rival in international football and San Marino, suggesting, impolitely, that Scotland were inferior to Europe’s whipping boys.
Bhoys left-back Tierney has been linked with a move to Arsenal this week and Robertson, who left Celtic Park at the age of 15, could be the perfect replacement.