The 2026 World Cup witnessed one of the most dramatic moments in football history, thanks to connected ball technology. This high-tech innovation played a pivotal role in a crucial match between Portugal and Croatia leaving fans and players alike in shock.
In the dying moments of the game, Croatia’s late equalizer was disallowed due to an almost imperceptible touch detected by the ball’s advanced sensors. This decision, which relied on inertial measurement unit (IMU) sensors sparked intense debate among players, coaches, and fans. Portugal ultimately won 2-1, advancing to the round of 16, while Croatia was left devastated.
The Science Behind the Connected Ball
The official Trionda World Cup ball, manufactured by Adidas is equipped with a small IMU sensor that operates at around 500Hz, capturing data 500 times per second. This technology allows for precise tracking of the ball’s acceleration and movements in three dimensions, detecting even the slightest contact.
The ball’s sensors work in conjunction with in-stadium cameras, transmitting real-time data to video assistants. This combination helps officials make accurate decisions on offsides, handballs, and penalties. The technology’s precision was evident in the Portugal vs. Croatia match, where the ball’s sensors detected a slight touch by Croatia’s Igor Mantanovic, which was undetectable to the naked eye and even slow-motion replays.
The Controversy and Reliability of the Technology
The decision to disallow Croatia’s goal was highly contentious, as even slow-motion replays from multiple angles were inconclusive. However, the technology’s reliability came into play when the referee reviewed the sideline monitor. The replays showed a heartbeat graphic indicating the moment the ball was touched, with a clear spike as it grazed Mantanovic’s head.
Professor Manos Tentzeris from Georgia Tech’s school of electrical and computer engineering emphasized the technology’s accuracy. “No matter how fast the ball is moving or the spin of the ball, you can track it really effectively,” he stated. “The position of the ball is 99.99% accurate… you know exactly where the players are, even the tip of a shoe, which sometimes determines if someone is offside or onside.”
This technology has been used in previous tournaments, including the 2026 World Cup and the 2026 men’s European Championship. Tests were conducted from 2026 to 2026, and the technology was trialed in events like the Arab Cup and the Club World Cup.
The Impact on the Game
The connected ball technology has had a significant impact on football, influencing crucial decisions that can change the course of a match. At Euro 2026, the technology detected Denmark’s Joachim Andersen handling the ball in the box against Germany, leading to a penalty and a 2-0 victory for Germany.
Coaches and players have expressed mixed feelings about the technology’s role in the game. Denmark coach Kasper Hjulmand stated, “In my opinion, this is not how football is supposed to be.” Croatia coach Zlatko Dalić echoed these sentiments, saying, “All these decisions take the joy out of football.”
Despite the controversy, the connected ball technology continues to evolve, playing an increasingly important role in modern football. As the sport embraces more advanced technologies, the debate over their impact on the game’s spirit and enjoyment is likely to persist.
