Manchester United's return to action after the international break turned sour in a dramatic 2-1 defeat to Leeds United, a match overshadowed by a controversial red card that left manager Michael Carrick fuming.

The visitors, looking sharper from the whistle, stunned Old Trafford with two first-half goals from Noah Okafor. United, appearing rusty, faced a mountain to climb after the break.

The game's pivotal moment arrived early in the second half. Defender Lisandro Martinez was shown a straight red card following a VAR review for an incident involving Dominic Calvert-Lewin. The decision, for what was deemed a hair-pull, reduced United to ten men and shifted the match's entire dynamic.

Despite the setback, a resilient ten-man United fought back. Casemiro powered in a header in the 59th minute to give the home side hope. However, Leeds United held firm to secure a historic first league win at Old Trafford in over four decades.

Post-match, Carrick's frustration was palpable. He branded Martinez's dismissal "absolutely shocking" and suggested the club would consider an appeal. "He goes to touch his shirt and gets a red card for it," Carrick stated. "It is not aggressive, there is no jolt, no tug... I know he touched his hair. There is a difference to really aggressively touching it."

The consequences of the red card are immediate and severe for United's defensive line. Martinez is now set to miss crucial upcoming fixtures against Chelsea, Brentford, and Liverpool. This blow is compounded by a potential suspension for Harry Maguire, who faces an FA charge, leaving United's backline in a precarious state ahead of a critical run-in.

While the defeat is a setback, United remain in a strong position in the top-four race, currently seven points clear of sixth-placed Chelsea. However, navigating the next few weeks without key defenders will be a significant test of their squad depth and resilience as they aim to secure Champions League football for next season.