Croatia Scored the Equalizer That Would've Saved Their World Cup — Then a Sensor Inside the Ball Took It Away
We were watching Portugal vs Croatia when it happened.
Round of 32. Deep stoppage time — the 103rd minute, well past regulation. Portugal was up 2-1. Croatia needed one more goal to force extra time. Then Josko Gvardiol tapped one in at the back post. 2-2. The stadium in Toronto exploded. Croatian players sprinted toward the corner flag.
Jinguk stood up from the couch.
Then the referee jogged to the monitor. We sat back down. But this time it wasn't a camera measuring a shoulder — it was the ball itself.
"Offside," the call came back. Goal disallowed.
Not because a player's foot was a millimeter too far forward. Because the ball, somehow, remembered being touched.
I had to ask Jinguk to explain that one from the beginning.
What Offside Actually Is
Here's the thing about offside: everyone who watches soccer knows it exists, but almost no one can explain it clearly on the first try.
Jinguk's version, translated from the Korean he uses when he's being patient with me:
"If you're closer to the goal than the last defender when the ball is kicked to you — that's offside. You can't just wait by the goal for an easy pass."
The official version: a player is offside if, at the moment the ball is played to them, they are in the opponent's half and closer to the goal line than both the ball and the second-to-last defender (the last one is usually the goalkeeper).
Any part of the body that can score — head, torso, feet — counts. Arms don't.
Why the Rule Exists
The offside rule is older than most countries' constitutions. It was written into football's first official laws in 1863 — the same year the Football Association was founded in England.
The reason is almost charmingly simple: they were trying to stop players from goal hanging. Standing near the opponent's goal, doing nothing, waiting for someone to boot the ball at you. No teamwork. No strategy. Just lurking.
The rule has been tweaked several times since:
- 1863 — Original rule: three defenders had to be between the attacker and the goal
- 1925 — Relaxed to two defenders, to encourage more attacking play
- 1990 — Being level with the last defender now counts as onside
- 2026 — Camera-based tracking (SAOT) and sensors inside the match ball itself now catch offside to the millimeter — and the millisecond
That last one is where it gets complicated.
The Technology That Took Croatia's Goal Away
This World Cup introduced something called SAOT — Semi-Automated Offside Technology.
It tracks 25 points on each player's body in real time — ankles, knees, hips, shoulders, elbows. When the ball is played, the system freezes that exact millisecond and measures every body part's position relative to the defensive line. To the millimeter.
But the Portugal-Croatia call wasn't decided by SAOT at all. It came down to something else entirely: the ball.
Every match ball at this World Cup — the Adidas Trionda — has a sensor built into it, an IMU, the same kind of chip that's in your phone or a fitness tracker. It can register the faintest contact. FIFA calls it Connected Ball Technology, and broadcasts now display it as a little "heartbeat" graphic every time the ball is touched.
Croatia's equalizer came off a scramble — a deflected cross, a loose bounce, a tap-in that never looked deliberate. To rule on it, the referee needed to know exactly who touched the ball last, and when. The sensor said Croatia's Igor Matanovic got the faintest flick on it moments earlier, which put his teammate offside when the ball reached him next.
FIFA released a statement afterward saying the ball's sensor data had "proven" that contact was made — which meant the offside call stood, no matter how invisible the touch looked in real time.
Jinguk watched the replay four times. Even at four times, he couldn't see it. "The rule is the rule," he finally said. He didn't sound happy about it.
The Debate Offside Always Starts
This is what Jinguk explained to me, and what I've been thinking about ever since:
There are two types of offside calls that feel very different to watch.
The first is obvious — a player is standing two meters past the last defender, clearly waiting for the ball. That feels correct. The rule is doing what it was designed to do.
The second is what happened to Croatia — not even a body position this time, but a touch so slight that the players on the pitch couldn't agree it happened. Croatia's midfielder said after the match he genuinely wasn't sure: "I don't know what is this... for me, it's a regular goal, but I don't know." Croatia's manager was blunter: "It kills the emotions. It kills everything within you."
That feels like something else. Not wrong, exactly. But stranger than anything a camera ever caught — because this time it wasn't about where a player's foot was standing. It was about whether a chaotic deflection counted as a touch at all.
Jinguk's take: "Football is a sport played by humans. When a sensor inside the ball is telling us a flick nobody saw actually happened, that's not what the rule was invented for."
I'm not sure I agree or disagree. But I think he's asking the right question.
What to Watch for in the Knockout Stage
Now that you know what offside is, here's what to look for:
The offside trap is when defenders deliberately step forward in unison to put attackers offside. It's a high-risk tactic — if the timing is off by even a step, you've left someone through on goal. When it works, it's elegant. When it fails, it's catastrophic.
VAR reviews will keep happening in the knockouts. Every close goal will go to review. The three-minute pauses are part of the experience now.
Tight games will turn on these calls. In a knockout match where one goal decides everything, an offside review in the 89th minute is an entirely different emotional experience than one in the 20th.
Portugal held on, 2-1. Croatia's World Cup ended right there, in the 103rd minute, on a touch nobody could actually see. Jinguk watched the last few minutes in near silence after that call. I made tea. We didn't talk much.
At some point he said: "I feel for them. They played a really good game."
That's the World Cup. The bracket is just the structure. The stories inside it are something else entirely.
Sumi | NYC + Hudson Valley | @miguktv on YouTube
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