Unseen in Seven Years: When Top-Up Training Becomes the Crack in Squad Depth

Unseen in Seven Years: When Top-Up Training Becomes the Crack in Squad Depth

There was a moment in October 2026 that Mikel Arteta described with just two words: "unfortunate." He did not say it in a press conference after a defeat. He said it after a top-up training session scheduled for the day after a 2-1 Premier League win over Leeds United. In football, not many managers dare to admit that their own training methodology has taken away two players before a Champions League match. But Arteta did. And what is more remarkable is that he did not hesitate to state that this incident "has never happened in seven years" of his tenure.

This raises a question that any tactical analyst must approach with caution: When a seasoned manager, who has built an empire in North London, calls an incident a "first time" after nearly a decade, is that a harmless outlier or a signal about the limits of a system being stretched to breaking point?

I have spent many years watching Arsenal's matches, particularly how Arteta manages the workload of his substitutes. The problem he posed in that press conference was not an excuse. It was an equation that any club competing in two top-tier competitions must solve: How do you keep substitute players match-sharp when they rarely play, without turning them into victims of the very process designed to prepare them?

The home win over Leeds was an important result. But it was also a node in the fixture congestion chain: Premier League on the weekend, Champions League on Tuesday. For a club with ambitions of winning both competitions, every match is not just three points or a qualification spot. Every match is a test of squad rotation capability. And that is why, after the final whistle against Leeds, while the starters entered their recovery process, another group of players remained on the training pitch. Piero Hincapie and Martin Zubimendi — two names mentioned in strategic substitute roles — participated in the post-match top-up session.

That was not an ordinary fitness drill. It was a "top-up" session — a technical term for high-intensity supplemental training designed to simulate match rhythm for players who did not play or played few minutes. At elite clubs, this is a standard part of load management programs. You cannot let a player sit on the bench for three weeks and then suddenly throw him into a derby. But you also cannot have him train as hard as a starter. The gap between those two extremes is where "unfortunate" injuries are born.

According to information from the press conference, both Hincapie and Zubimendi encountered problems during that session. Arteta described it as "two unfortunate actions" — a tidy phrase for a painful event. Both players had to wait for scan results to determine the severity. And for a team preparing for a Champions League match against Lille on Tuesday, the timing of the injury mattered no less than the injury itself.

Hincapie, 24, was described as having started the Champions League win over Napoli. Zubimendi, 27, was said to have made five substitute appearances in the Premier League this season. Both belong to the category of players with limited minutes — those being prepared to serve as backup options for a long season with a congested schedule.

This is the point where tactical analysis must separate itself from the emotion of the news. An injury to a substitute is not the same as an injury to a starter. It does not immediately collapse the tactical system. But it thins the buffer — something any club needs when entering the business end of the season. And when you are Arsenal, a club expected to compete in both the Premier League and Champions League, that buffer is the boundary between a successful season and a collapsed one.

Arteta explained his logic with a sentence I consider the most important tactical statement of the day: "If they never train, they don't get injured. The consequence of that is when you ask them to play they have no rhythm and no impact." This is a completely rational argument. It acknowledges a truth many managers avoid: that a substitute who is not properly trained becomes a worthless investment when the team needs him. But it also acknowledges another truth: that this method carries risk. And that risk materialized.

The question is: Is this a random outlier, or a sign of a system being operated too close to its safety limit?

The important thing to recognize is that Arteta did not blame external factors. He did not blame the pitch, the weather, the schedule. He took responsibility for his own methodology. In modern football, when a manager dares to say outright that his own training program caused injuries, it is a sign of high control and accountability. But it is also a sign of fragility. Seven years is long enough for a system to be validated. And when an incident that "has never happened" appears in year seven, it forces you to think about what has changed.

What has changed? It could be the schedule. It could be the number of competitions. It could be the pressure. Or it could be — and this is the possibility I find most concerning — that the medical and fitness staff are being stretched by the very success of the team. When you play in the Champions League, each top-up session does not just serve one match. It serves a longer, more complex sequence of matches, with less recovery time.

But there is another angle I want to put on the table. In the world of football, we tend to exaggerate the impact of injuries to substitute players. We see a familiar name on the bench and assume it is a big loss. But the tactical reality is more complex. If Hincapie and Zubimendi really are just backup options — players with limited minutes — then the short-term impact of this injury on Arsenal's starting XI may be smaller than the headlines suggest. The core squad is still there. The starters are still there. The problem is not the Lille match. The problem is what happens after that — in December, when the schedule is at its densest, when those substitute names become unlikely heroes.

The summer of 2026 taught me a lesson about never underestimating the importance of squad depth. When I followed Atalanta under Gian Piero Gasperini, the club sold several key players and only supplemented with loan deals. On paper, the starting XI was still strong enough to compete. But when injuries and suspensions hit, there were no backup options of sufficient quality to maintain the rhythm. That was a lesson about the fragility of a system that relies only on eleven players.

Arsenal are not in that situation. They have a carefully invested squad. But the incident at the top-up session is a reminder that even the best systems have weak points. And Arsenal's weak point at this moment is not in tactics, not in finances, not in any issue visible on the news ticker. It is in the gap between what a player needs to be ready and what his body can endure.

Arteta called it "two unfortunate actions." I call it a signal about the limits of load management science in modern football. You can program everything: minutes, intensity, recovery time. But you cannot program the human body never to break down. And in a season where every point can decide the title, an injury at a top-up session can make the difference between having a reliable backup option and having to throw a young player into a massive match.

So what happens next? The answer lies in the scan results — which both Arteta and Arsenal fans are waiting for. If they are minor injuries, the story will fade within days. If they are long-term injuries, the question will no longer be about the Lille match. It will be about Arsenal's ability to sustain ambition in both competitions with a thinned buffer.

I will be watching Arsenal's starting lineup against Lille. Not to see who starts, but to see who sits on the bench. Because in modern football, the bench is not just a place for those not good enough. Sometimes, it is the most accurate reflection of a team's true strength.