It was unclear what Almiron said to Turkiye's Mert Muldur under the cover of his hand, but it may have been his last gesture in this FIFA World Cup.

The FIFA-proposed law, approved by the International Football Association Board in April, came after Benfica's Gianluca Prestianni was accused of making discriminatory slurs to Real Madrid's Vinicius Junior under the cover of his shirt during a UEFA Champions League game that the referee halted, invoking UEFA's anti-discrimination protocol.

Prestianni, ‌who ⁠denied the accusation, was given a six-match suspension by UEFA for discriminatory conduct that was deemed homophobic.

In an ill-tempered match fraught with heated exchanges, Almiron's red card before half-time was eclipsed by Paraguay's stunning victory in San Francisco, which keeps its faltering FIFA World Cup alive and condemned Turkiye to a miserable early exit after defeat to Australia last weekend.

The dismissal for the former Newcastle United player means he will miss Paraguay's decisive final Group D match against the Socceroos on 23 June (AEST).

Almiron made a post on Instagram of his team celebrating its 1-0 win, but made no mention of his dismissal.

"I want to thank the effort of my team-mates today, giving everything in each ball, thank you, thank you, thank you, I'm proud to be part of this squad," he posted alongside an image of ecstatic Paraguay players piling on top of each other at the final whistle.

Paraguay coach Gustavo Alfaro, who hailed the fighting spirit of his players, said he accepted the rules had been applied.

"The first thing I told him when he came into the dressing room was, 'change that face, we won, don't feel guilty about anything. What happened brought out even more of your teammates' fighting spirit'," he said.

Alfaro has been on a mission to shield his players from the heavy criticism endured after their opening game 4-1 trouncing by co-host United States, which is the group winner after beating Australia 2-0 on Saturday (AEST).

"He was in a lot of pain because he felt that, for a player of his experience, those things can't happen," he said of Almiron.

"But it happened. That's it. We're here to support him, to carry him, to push him."

The new measure does have exceptions, however, such as allowing players to cover their mouths during friendly conversations with club team-mates on opposing teams.

The rule was among several introduced ahead of the showpiece event including five-second countdowns on throw-ins and goal kicks, time limits for substituted players to exit the field, and players made to stay on the sidelines for one minute after receiving on-field medical treatment.

Alfaro said some of the new rules could hurt the game and a yellow card for Almiron would have sufficed.

"The fear I have is that football loses its essence," he added. "Let's not become slaves to the rulebook."