Kieran Tierney was always going to be a difficult man to replace at Celtic Park. But, forgive me for thinking that more than two years after his departure Celtic would have a more than capable replacement in the ranks.
Greg Taylor's injury is the latest in a growing list of defensive selection headaches facing Ange Postecoglou. His absence leaves the left side of defence without a recognised or proven replacement.
We only need to rewind a few weeks to remind ourselves of our dire goalkeeping situation or preparing for the CL qualifiers with only one right-back in the first team squad and a central defensive partnership with less than 20 Celtic appearances between them.
Since then, Joe Hart, Josip Juranovic and Cameron Carter-Vickers have all walked through the door at Parkhead. And each of them has put in worthy performances convincing the Celtic faithful that both quality and experience has been added to their respective positions.
The same can't be said for the position on the left-hand side of defence.
Scottish international, Taylor, has more often than not, been the man to claim a starting place and while you can't fault the 23-year-old for effort, his ability is limited. With a shoulder problem now keeping him on the sidelines for up to two months, Postecoglou's options are frustratingly sparse.
Adam Montgomery has shown in small glimpses that he is capable of playing his part this season, but he's not quite ready for the demands of first team football, week in week out, in the Celtic defence.
Ange knows that and that's why he selected Josip Juranovic ahead of the academy graduate (who actually operated as a forward before his first team appearances) in the Glasgow derby. The Croat looks like a very talented player but he will excel on the right flank and it's unfair to judge him for his performances on the left.
Then there's Bolingoli, who was preferred to Montgomery for Celtic's last outing against Livingston. Even before the infamous 'trip to Spain' fiasco, the Belgian was inconsistent and prone to more than his fair share of errors in a Celtic jersey. He is not the answer.
That leaves us with Liam Scales, signed from Shamrock Rovers in the summer window. His recent absence from the first team squad has been conspicuous and perhaps telling that the step up from the League of Ireland to the rigors of first team football at Celtic park, are as big a challenge as many thought.
I'm sure Postecoglou will already have one eye on this position looking forward to the next transfer window and I wouldn't be surprised if he ventures back to the Japanese market, where his biggest success story at Celtic so far, Kyogo Furuhashi, was plucked.
Who do you think will claim the left back spot until the new year? Let us know in the comments.