Brazil holds the most World Cup crowns – five in total – but after five consecutive tournaments without adding another, the squad is now heavily relying on analytics. Every player dons a sensor‑filled “smart vest” that records position via GPS, heart rate and a metric known as “player load,” similar to the stats shown on a Whoop band or Apple Watch, but calibrated for football.
So what do these smart vests actually monitor? The vests are worn beneath the jersey and are used across Brazil’s men’s, women’s and youth teams. Each club transmits match or training data to the national setup each day. This allows sports‑science director Guilherme Passos to track a range of indicators such as sprint speed, fatigue levels and hamstring rehabilitation, not only for the senior side but also for players scattered around the globe.
The vests remain on during World Cup games, helping decide which athletes need rest between matches. Here’s the twist: Passos once flagged a player who covered just about 3.7 miles in a match – roughly half the distance of his teammates. By the numbers, he appeared to be a low‑effort player.
Why did the data nearly get the Brazilian out of the lineup? When coaches reviewed the footage, they discovered that the player, as Passos put it, was always in the right spot, occupying the perfect tactical position (via BBC). The player’s identity remains confidential for obvious reasons, but the lesson is clear: higher running totals don’t automatically translate to better performance, and the most effective player can generate the dullest smart‑vest statistics.
This isn’t a Brazil‑only phenomenon. FIFA approved GPS‑vest systems for official matches back in 2015, and most of the 48 teams at this World Cup are employing similar technology from firms like Catapult and STATSports – the same brands that power many consumer fitness devices. FIFA has also deepened its data push this year with Football AI Pro, a Lenovo‑built assistant that uses machine learning to dissect match data and deliver real‑time insights to coaches and players.