Celtic face a defensive headache with right-back Alistair Johnston sidelined until October, forcing manager Brendan Rodgers to consider his options before the transfer window closes. The injury, reported by the BBC this week, leaves Colby Donovan and Anthony Ralston as the primary cover for a critical period that includes the Champions League play-off second leg against LASK and the first Old Firm derby of the season.

Johnston, a key figure for Canada, missed a large portion of last season with injury and now faces another spell on the treatment table. His absence will be felt across multiple competitions. He is confirmed to miss the return leg against LASK, domestic Premiership clashes with Aberdeen and St Mirren, and the highly anticipated double-header with rivals Rangers.

Who will cover at right-back for Celtic?

With Johnston out, the immediate responsibility falls to Colby Donovan and Anthony Ralston. Donovan impressed many with his performance in the first-leg victory over LASK, showing composure and attacking intent. His display has given Rodgers a viable internal solution. Ralston, a long-serving Celtic squad player, offers experience and familiarity with the demands of the Scottish game. The club's current squad list shows these two as the only natural right-backs available for the coming weeks.

Rodgers now has a decision to make: trust the players he has or enter the market for a short-term solution. The transfer deadline adds pressure to this assessment. Bringing in a new player would require them to adapt quickly to a high-stakes environment, while sticking with Donovan and Ralston tests the squad's depth.

What does Johnston's absence mean for key fixtures?

The timing of the injury is far from ideal. Celtic's upcoming schedule is packed with matches that could define their early season. The second leg against LASK is paramount for securing a place in the Champions League group stage and the substantial financial reward that comes with it. Domestically, dropping points in any league game is costly, but matches against Rangers carry extra weight in the title race.

Missing these fixtures is a significant blow for Johnston personally, as he looked to establish himself after last season's setbacks. For the team, it tests their resilience and the planning done over the summer. Supporters can track the team's progress and the tight league standings as these games unfold.

How has the squad depth held up so far?

Celtic's start to the campaign has been strong, but injuries are an inevitable test of a squad's mettle. The situation at right-back is the most pressing, but managing the fitness of the entire group is vital for a long season competing on multiple fronts. The club's medical staff, detailed on the injuries page, will be working to ensure Johnston returns on schedule and that other players avoid similar issues.

Rodgers has often spoken about needing a squad where every player is ready to contribute. This period is a practical examination of that philosophy. Performances from players like Donovan when called upon can strengthen the manager's belief in his existing group and influence future transfer decisions.

What are the immediate next steps for Celtic?

The immediate focus is preparing for the next match without Johnston. Training sessions will be used to solidify the understanding between whoever plays at right-back and the players around them, particularly the right-sided centre-back and winger. Tactical adjustments may be minimal, but ensuring the replacement is confident and clear on their role is essential.

Behind the scenes, the recruitment team will be scanning the market, but any move would need to represent clear value and a guaranteed upgrade. The financial aspect always plays a part, and funds might be reserved for other priority areas. For now, the show must go on with the players available. Celtic's next fixture is the second leg of their Champions League play-off against LASK, a match scheduled for this coming week where a place in the group stage is on the line.