Hallam was officiating his first game in the Premier League after refereeing games in the English Football League since 2023. He was called across to the screen by his VAR colleagues in Stockley Park to review whether Yerson Mosquera had committed a handball when marking Omar Marmoush.
And in an increasingly rare example of a referee backing his own decision rather than following VAR's recommendation, Hallam announced: "After review, the ball hits the arm of the Wolves player, which is in a natural position, so the on-field decision will remain."
While Wolves' boss Rob Edwards praised the referee for backing his decision, Guardiola felt differently. And he called for an explanation from Premier League referees' chief Howard Webb.