Card-based disciplinary tools — yellow for caution, red for dismissal — made their formal debut in football competition at the 1970 World Cup. Prior to that point, no on-screen indicator existed to help audiences understand what a dismissal or caution actually meant in practice.
During a Copa AUF Uruguay knockout-round fixture between Nacional and Rentistas on 15 October 2026, Eduardo Varela became the first referee to manage the match's disciplinary process through a handheld electronic device rather than the conventional card system. With Juan Pablo Plada's foul on Maxi Silvera in the 12th minute drawing a yellow card from the referee, the Rentistas midfielder became the first player to receive a caution logged under the newly introduced digital booking system.
A joint undertaking between the Uruguayan Football Association (AUF) and a private technology firm brought the platform into being. Built to serve as an all-in-one control point for running matches, the device consolidates every aspect of game administration into a single platform.
Designed to sit in the hand much like a smartphone, the updated electronic cards take on a form factor that mirrors the familiar handheld device. Two physical buttons built into the unit let a match official switch the display between a bright yellow and a red colour, making the nature of any disciplinary call immediately visible on screen.
Refereeing official Marcelo De Leon has outlined a target of sending match data to the sport's governing body in real time, with a longer-term aim of extending that feed to news organisations worldwide. Provided the infrastructure rolls out consistently across Uruguayan football, each yellow card, substitution, goal, and spot kick would be captured in the records at the moment of occurrence — available to referees and media alike without delay.
Built without reliance on a standard WiFi connection, the new digital card device carries that wireless independence as a core part of its engineering. Even arenas tucked far from urban infrastructure, or lower-division grounds where internet access has always been patchy or absent, fall within the operational scope of the technology.
Questions about how well the digital cards could actually be seen under varying light conditions were put forward by both observers and officials. Bright sunlight beating down on the display left spectators at the Defensor Sporting versus Plaza Colonia fixture struggling to make out what the screen showed from any real distance. Spectators inside the ground and those watching on television during the Nacional–Rentistas night fixture noted that the card colours appearing on broadcast screens lacked the sharpness needed to distinguish them from the standard yellow and red.
