Spain’s 1-0 victory over Argentina in the final closed the 2026 World Cup, but the tournament’s integrity is now under scrutiny after an international monitoring body issued seven yellow alerts for possible match manipulation. The Copenhagen Group, a network of national platforms operating under the Council of Europe’s Macolin Convention, analysed all 104 matches and identified anomalies in betting markets that it says warrant further investigation. The alerts, classified as the second-lowest on a four-tier scale, do not constitute proof of fixed matches, yet they directly challenge FIFA’s own task force, which declared on Tuesday that it had found “no suspicious betting activity or indication of match manipulation” across the entire competition.

Among the incidents flagged, the red card shown to South Africa’s Themba Zwane in the 84th minute of the opening match against Mexico drew attention from monitors. A far larger financial irregularity surfaced around Spain’s goalless draw with Cape Verde: the crypto-based prediction platform Polymarket recorded $4.8 million in bets that the eventual champions would fail to win, a volume that European integrity analysts describe as highly unusual for a group-stage fixture. The same Spain side featured in a second alert, when a three-and-a-half-minute VAR review disallowed a Ferran Torres goal during a 4-0 win over Saudi Arabia, a delay that coincided with unexplained odds fluctuations.

The most contentious case involves United States forward Folarin Balogun. On 2 July, the day he was sent off against Bosnia and Herzegovina, Polymarket opened a market asking whether he would play against Belgium in the next round. Three days later, FIFA’s disciplinary committee suspended the automatic one-match ban, making him available — a reprieve not granted to any of the other 14 players red-carded during the tournament. The Copenhagen Group has sent a formal request to FIFA for a written explanation. Viewed from Washington, the episode carries an additional political layer: President Donald Trump telephoned FIFA president Gianni Infantino to request a review of the red card, a call that European governance observers note raises questions about external pressure on disciplinary processes.

The scale of the global betting market underscores the stakes. The Copenhagen Group estimates that $240 billion was wagered on the 2026 World Cup, roughly double the figure for Qatar 2022. While yellow alerts can be triggered by innocent factors — such as hedging by smaller bookmakers or social media rumours — the group’s decision to place 15 matches under enhanced surveillance and to analyse 12 major controversies signals a level of concern that contrasts with FIFA’s blanket reassurance. Christian Kalb, a betting industry expert who has previously worked with the Copenhagen Group but was not involved in this report, told a US sports publication that unusual odds movements can often be explained by risk management rather than corruption, but he cautioned that the presence of prediction markets introduces new conflicts of interest and potential for insider information.

The full Copenhagen Group report has yet to be published, and the remaining three yellow alerts remain undisclosed. With FIFA already discussing an expansion to 64 teams for the 2030 tournament, the monitoring challenge will only grow. For now, the seven alerts hang over a World Cup that ended with Spain’s triumph, leaving integrity officials in Europe and the Americas to await the detailed findings that will either substantiate or defuse the suspicions.