Headcount is still a thing in football. When fit last season, Greg Taylor, was first choice left back. During his several injured periods, Josip Juranovic moved across from the right to cover. In the early weeks of Ange Postecoglou’s tenure, before the arrival of Josip, Adam Montgomery (then 18) was used. You knew when illness was really affecting Celtic on the three occasions Boli Bolingoli made the squad.
Bolingoli will remain the choice only when there is absolutely no alternative, although he will hopefully depart this window. Until this morning, that left Celtic with Greg and Adam. The latter has now joined St Johnstone on loan.
If we follow the headcount rule, we can be confident that Argentinian left back, Alexandro Bernabei (21) came through his medical without issue and will be confirmed shortly. I cannot see Adam Montgomery being allowed to leave otherwise.