NEC and the Substitution Problem: Sierhuis Warmed Up, Linssen Still Played the Full Match

Minute 68, score 1-1. Kaj Sierhuis had completed a full twelve-minute warm-up on the touchline, shirt soaked through, and then he sat down. Inside the pitch, Bryan Linssen kept running — shorter strides, slower, each burst of acceleration losing half a beat. By minute 90, NEC's substitution board still held unused slots. The match ended 1-1 against Levski Sofia. The stands sang Sierhuis's name. The television cameras did not show the workload-tracking sheet on my monitor, and that sheet tells a very different story from the “frustrated player” narrative the papers are running. I once sat in the data room of a sports channel during the France–Belgium semi-final at the 2026 World Cup, when Vertonghen had covered 7.9 km and his average speed had dropped 23 percent compared with the first half. I handed that number to the commentator. He talked about fighting spirit. In minute 58, France scored immediately after a slow step from Vertonghen. Three weeks later, I sat through the footage of all 64 matches to cross-check the data against what actually happened. Since then, whenever I see a player finish his warm-up and sit down, I do not read it as emotion. I read it as data. NEC Nijmegen are in the phase every mid-tier Eredivisie club dreads: a European calendar stacked on top of the domestic one. Dick Schreuder's squad has to be split across two competitions, and this is precisely when the value of a backup striker gets repriced in minutes played rather than in transfer fees. On paper, this is the perfect environment for someone like Kaj Sierhuis: 27 years old, an Ajax academy product, once highly rated before injuries and loan spells pulled him off his trajectory. Last summer, NEC signed him from Fortuna Sittard on a free transfer. No fee. No amortisation cushion to justify leaving him unused. That is the first thing to separate out. A free signing means low financial risk. It also means there is no amortisation buffer, and if the player is neither used nor sold, the only remaining cost is his wage — a form of dead cost, quietly leaking week by week. The transfer market is the only place where people pay for hope rather than for output; NEC bought hope at zero cost, and is now keeping it on the bench. Seven matches have passed this season. Kaj Sierhuis has one start — in a 0-3 defeat. Three substitute appearances. Three matches sitting the full 90 without being called. Not a single minute in Europe, despite being on the registered list. Over the same stretch, Bryan Linssen — the man Schreuder has chosen as his preferred No. 9 — has started almost everything, including games in which his intensity visibly dropped in the second half. Every number is a confession, if we are patient enough to listen. Here, the confession lies in the structure of the substitution decision. With the score at 1-1 and the starting striker out of fuel, a club with a European schedule usually throws on a fresh striker to create new pressure. Schreuder did not. That is a pattern, not an isolated slip: the same player, the same scenario, three times in seven matches. In my 2026 V.League file, there is a structurally similar match. On matchday 18 against Hanoi FC, I found that midfielder Nguyen Trong Huy had covered only 8.2 km in 90 minutes — 15 percent below the team average. I recommended substituting him on 60 minutes. The coaching staff ignored it. The team lost 1-3. Afterwards I presented a 14-page analysis, and from the following round the head coach began to follow my adjustments. The team finished fifth, four places above the pre-season projection. The lesson is not that I was right. The lesson is that a delayed substitution is not a neutral choice. It is a choice with a price. At NEC, that price may be two points dropped in minute 85, when an ageing striker no longer has the burst to attack the last available space. The stands sang Sierhuis's name. This is important data, even if it is not the kind of data expected-goals models record. Singing from the stands is a pressure indicator: it shows the crowd has read something the scoreline does not say — that the club is leaving a healthy resource idle while the resource in use has run down. For a mid-tier club, this is the hardest form of waste to justify, because it has nothing to do with money and everything to do with minutes — the one resource that cannot be bought back once the season ends. And here I have to stop myself. A player who looks annoyed as he leaves the pitch is not evidence of a dressing-room crisis. It is evidence of a facial expression, captured by a camera, retold by an article citing a regional newspaper and a few social-media comments. This entire story stands on one leg. Numbers never lie, but the people reading them do — and the reader here, myself included, is inclined to over-read. The opposite hypothesis also holds up logically: Sierhuis may be a profile that does not fit Schreuder's system. If the coach wants a No. 9 who presses high, drops deep to hold the ball up and joins the circulation chain, then a pure box striker will not be selected regardless of form. In that case, Sierhuis sitting out is not abandonment — it is a profile decision. And if that is true, then the stands singing his name simply means the stands are singing for the player they want to see, not the player the team needs. I do not have the data to adjudicate between these two hypotheses. There is no pressing metric, no touch map, no data on the shape Schreuder wants to operate. An honest data person has to say that out loud instead of filling the gap with speculation. Turning 62 has not slowed me down; it has taught me which data is worth waiting for. The signal to track next round is very specific. If Sierhuis records a fourth consecutive unused bench, the probability of him leaving NEC in the January window rises substantially — more likely on loan than on a sale. If Linssen keeps playing over 85 minutes per match for the next three weeks, his muscle-injury risk compounds, and NEC will be forced to use Sierhuis in a situation where there is no other choice. Just look at the numbers and you understand everything: a club cannot play in Europe and depend on a single striker who is past his peak. And if Sierhuis comes on next match, scores, and then sits out again the game after — then we will know this story was never about form.