The Evolution of Match Officiating Technology

At the 2026 World Cup, the referees on the field and the officials in the video booth will have access to an unprecedented arsenal of technology designed to eliminate blown calls. The video assistant referee (VAR) system and semi-automated offside technology (SAOT) have been part of soccer for years, but the setup deployed this summer represents the most advanced use of adjudication tech in any high-level sport to date.

During each match, the pitch becomes a data-rich environment flooded with sensors, cameras, and cutting-edge computer vision software. The most notable advancement is the integration of digital twins—high-resolution 3D scans of every player captured before the tournament. These digital replicas, accurate to within one to two millimeters, can be dropped into a virtual simulation of the game to determine exact positions relative to the ball, boundary lines, and opponents. Officials use this data to spot infractions, determine penalties, and ensure fairness.

Despite the sophistication, human referees remain essential. The technology serves as a safety net, correcting errors when challenged. The system is primarily used to catch big mistakes—like checking whether a player was offside during a goal-scoring play—but teams can also request reviews for seemingly inconsequential moments. This raises philosophical questions: should the system focus on pivotal moments, or does its value lie in policing every inch of the game?

The Eyes Have It: Hawk-Eye and Ball Sensors

FIFA and global soccer bodies have made their stance clear: they want both big errors and the smallest inches corrected. The 2026 setup resembles the 2022 World Cup but with significant upgrades. Hawk-Eye, the optical tracking provider, now uses 16 high-resolution cameras—up from 12 in 2022—to capture over two dozen skeletal points on each player at all times, according to FIFA innovation director Johannes Holzmüller.

This optical data is combined with advanced sensors inside the match ball. Kinexon, a leader in sports wearables, provides the ball’s digital brain. The 2026 version includes an ultrawide-band and inertial measurement unit (IMU) sensor—featuring both accelerometer and gyroscope—that tracks the ball’s precise location and distinct touches 500 times per second. The previous design used a string-based sling to suspend the sensor in the ball’s center. The new design places the sensor inside a small bladder that is vulcanized along the interior wall. Maximillian Schmidt, Kinexon’s cofounder, notes that vulcanization is far more stable than the earlier hooks and strings, which could break. To counterbalance the added weight and prevent wobbling, the team calibrated the system to ensure every touch is tracked evenly. Robust impact testing accounted for direct kicks against the sensor.

Together, these optical and in-ball tracking systems capture every nuance of all 104 World Cup games. The real innovation, however, comes from borrowing technology from the virtual reality world—digital twins.

Digital Twins: Millimeter Precision from Player Scans

Lead-up to the tournament saw all 2026 World Cup players undergo a 360-degree high-resolution scan by FIFA’s tech partner Lenovo. These scans replace generic avatars previously used for offside and other VAR applications. Art Hu, Lenovo’s global chief innovation officer, says the scans define the body’s shape, muscle tone, and even shoe size with an accuracy of one to two millimeters—an order of magnitude improvement over ordinary avatars. The technical challenge lies in taking a single static scan and applying that digital twin to Hawk-Eye’s skeletal pose data during active gameplay—when players are running, jumping, or sliding. Achieving this extra precision requires enormous computing power and algorithmic tuning.

FIFA tested the new system at the Club World Cup and Intercontinental Cup in 2025, as well as at various youth tournaments over the preceding 18 months. Earlier versions of the digital twin tech already assisted VAR decisions for goals and penalty kicks. The new system also helps review red-card penalties and incidents where an on-field official accidentally penalizes the wrong player. VAR technicians can overturn corner kick decisions if the system detects the error and alerts referees via headset without delaying the game—provided the calculation is fast enough. Slower, complex calls that would slow the game are excluded from this automated review.

To further reduce wasted time, VAR now sends immediate alerts to sideline officials for obvious offside decisions, stopping play right away. This contrasts with past arrangements that allowed play to continue and only stopped later if a goal or penalty occurred. Holzmüller expressed confidence that the upgraded accuracy will enable correct calls on even the most nuanced decisions, such as “when there’s only one toe offside.”

The Goalkeeper View and the Quest for Inches

While most offside plays can be spotted using slowed-down broadcast footage, a handful of infractions occur at the precise moment between video frames. FIFA is determined to solve this. Holzmüller explains that combining the 3D scans with ball-tracking data—which captures positions 500 times per second (higher resolution than video’s 60 frames per second)—supplements video footage to provide the most complete picture possible.

One especially interesting feature is the “3D goalkeeper view” within VAR. This visualizer shows the goalie’s point of view and uses digital inputs to determine if an attacking player in an offside position interfered with the keeper. This interference has long been illegal, but the number of players and field size have made it difficult to call accurately. The digital twin and ball data now make such judgments possible.

Hu points out the wide array of potential uses for digital twin technologies across sports, from officiating to athlete health and performance. As models become more powerful and computing costs drop, they will only improve. It is fair to wonder if the juice is worth the squeeze for gaining an inch or two of resolution on certain rare calls. Holzmüller readily admits these advances might only change a few calls throughout the entire tournament. But from FIFA’s perspective, for arguably the world’s biggest sporting event, the value is unquestionable.

“We have to bring the best technology to the World Cup,” Holzmüller says. “That’s our goal.”

Source:Ars Technica News