Celtic’s summer rebuild is going to be brutal, and bigger than some think.

Looking at the summer ahead, I honestly don’t think this is just another transfer window for Celtic.

It feels much bigger than routine squad tweaking.

Between loanees heading back, possible key departures and obvious areas needing strengthened, this could become one of those rebuild moments that shape not just next season, but the next few years. I’m not panicking, but I am watching closely, because there is a lot that needs sorted.

The scale of the summer work could be enormous.

The squad still looks unfinished when it comes to recruitment. Celtic need a right-sided attacking midfielder, two strikers, a right-back, a left-back and another central defender. In addition, the club may need a new goalkeeper if Kasper Schmeichel does not stay for another year.

As of February 2026, Celtic are already in the middle of a transition period after managerial instability and disappointing results.

Brendan Rodgers left in October 2025. Wilfried Nancy lasted just 33 days before his dismissal in January. The return of interim manager Martin O’Neill has stabilised things for now, and in my view that was the right decision.

First, there are the loan players. Six arrived during the January window. These included Julián Araujo, Tomáš ?van?ara, Benjamin Arthur, Joel Mvuka and Junior Adamu, alongside the signing of Alex Oxlade-Chamberlain.

At first glance, that looks like strong recruitment.

However, these are arrivals brought in as short-term solutions. They were brought in to help until the end of the season. Most of them will return to their clubs. That means gaps will reopen across the pitch this summer. Loans are useful temporary fixes, but when several leave at once you realise how much depth they were providing.

If Celtic do not act early, those players will disappear and the squad could suddenly look very thin.

That is why the club must move quickly and bring in high-quality replacements rather than more short-term fixes.

This, of course, is complicated by the fact we’ll be hunting a manager first.

Recruitment now seems focused on mentality and personality; that might depart alongside Martin O’Neill.

The goalkeeper situation is particularly important. If Schmeichel leaves, Celtic will need a reliable successor. Changes in that position always affect the defence, especially for a team that builds from the back. Communication, leadership and authority matter as much as ability. Schmeichel has vast experience, but he looks to be nearing the end of his time. The club must prepare properly for that transition.

Defensively, even beyond the loan exits, another centre-back still feels necessary. Competition improves standards and protects the squad from injuries or loss of form. Europe always exposes weak depth, and Celtic have learned that lesson more than once.

Midfield balance is another concern and this is where we’re going to see big changes.

If Reo Hatate leaves, replacing his creativity and drive will not be easy. At the same time, the squad could use a strong ball-winner. Someone who breaks up play would give attacking players more freedom and add steel when matches become physical.

Players are not machines. They need rotation and support.

McGregor will be at the end of his time soon; the task of transitioning in his replacement should already be underway and it’s not. The Forest bid means that Engels may leave in the summer; I’d say that’s almost a certainty. We’re looking at two midfield replacements at least and I can see the club moving on Bernardo and possibly McCowan as well.

There are also uncertainty around Daizen Maeda; if he leaves, Celtic would lose pressing, pace and intensity.

His work rate and mentality are difficult to replace.

If multiple first-team players leave in the same window, this stops being a refresh and becomes a full rebuild.

Financially, Celtic usually operate sensibly. The model focuses on development, value and reinvestment. This has been a dismal failure in recent years and another bad transfer summer could really put us in a precarious place. Signing potential is one thing. Expecting immediate performance is another.

A large turnover also affects dressing-room leadership, team chemistry and tactical consistency.

It is easy to sign talent and expect instant success, but cohesion takes time.

Understanding a new system takes time.

Supporters, myself included, are not always patient when standards are high.

Domestically, Celtic need consistency. In Europe, they need improvement. Balancing those demands is always difficult, and this summer that challenge may be greater than usual. The scale of this is daunting.

The best-case scenario is clear. We hire a manager quickly, and maybe a director of football. Key players stay, recruitment is sharp and the squad comes out stronger. The worst case is also obvious. Dragging the feet on the manager, too many exits, rushed short-term signings and another period of instability that nobody wants. The scouting has to be perfect. Almost every signing has to be right.

Personally, I’m not panicking. However, I am realistic. This does not feel like routine squad maintenance.

It feels like one of those defining transfer windows that shapes the club’s direction for years.

When you add everything together, the scale of the job becomes clear.

Six loan players may need replaced. A new goalkeeper could be required. Defensive depth, midfield balance and attacking options all need attention. Depending on who stays and who leaves, this could be tricky evolution or a major rebuild. It looks more and more like the latter.

Either way, recruitment quality will be critical.

Get this summer right and Celtic move forward with strength.

Get it wrong and the club risks falling into another period of uncertainty.

Would you trust these people to do it?

That’s the biggest worry of them all.