Manchester United's Champions League Challenge: Left-Back Dilemma

Manchester United step back under the Champions League lights tonight, almost three years after their last appearance, and already one decision hangs over Michael Carrick’s plans like a cloud: who plays at left-back?

United face Sabah FK in their first game in the competition since that miserable 2023 group-stage exit, when Erik ten Hag’s side finished bottom and drifted out with barely a fight. The format has changed, the field has expanded to 36 teams, and the expectations are clear: if United find themselves anywhere near the bottom again, something will have gone badly, visibly wrong.

Carrick has a starting point. Senne Lammens will be in goal. In front of him, though, the picture blurs.

A defence that has leaked too many chances already this season needs to tighten up quickly. Diogo Dalot is likely to keep his place on the right, if only for a touch of continuity, but the centre-back pairing is ripe for a shake-up. Leny Yoro could come in alongside Harry Maguire, with Lisandro Martinez the obvious candidate to step aside.

Martinez has looked off the pace in recent weeks. Rusty in his timing, a fraction late in his challenges, he carries the look of a defender who needs a breather. With the Manchester derby looming this weekend, pulling him out of the firing line now makes sense. Rest, reset, and have him ready for City.

Left-Back Dilemma

Then comes the real dilemma.

All eyes will be on the left-back slot when the team news drops. Luke Shaw did not train on Wednesday. Carrick insisted there were no injury concerns, describing it as a rest day, but with such a tight turnaround before the derby, that almost certainly rules him out of starting tonight. United have been here before: relying heavily on Shaw, then scrambling when he is unavailable.

Harry Amass did train, and the teenager’s progress has been one of the more encouraging subplots at Carrington. Throwing him into a Champions League opener, though, would be a huge gamble. Patrick Dorgu offers another option, but his strengths lie higher up the pitch and using him deeper would dull his attacking edge. That leaves the pragmatic solution: shift Noussair Mazraoui across to the left.

It is not ideal. It might be necessary. And it underlines a wider issue: United’s failure to properly reinforce at left-back over the summer now threatens to bite just as the stakes rise again in Europe.

Midfield Structure

The midfield, at least, looks more settled. Kobbie Mainoo will start, the young midfielder already an essential part of Carrick’s structure. Youri Tielemans is expected to partner him again, giving United a blend of control and passing range at the base. Ahead of them, there is no debate. Bruno Fernandes remains the first name on the teamsheet, the man tasked with stitching attacks together in that advanced role.

Forward Planning

Up front, the planning becomes more strategic, with Sunday in mind.

Benjamin Sesko’s minutes are being handled carefully. With City on the horizon, it would be reckless to start him tonight and risk ruling him out of the derby. United need him fresh for that. So the responsibility of leading the line is likely to fall to Matheus Cunha, whose work rate and movement can stretch Sabah’s backline.

Out wide, Bryan Mbeumo and Marcus Rashford should provide the support. Mbeumo offers direct running and delivery from the flank; Rashford brings pace and threat on the break, the kind of weapon that can turn a cagey European tie in a single moment.

So the shape of United’s side is there, almost complete. Lammens in goal. Dalot, Maguire, probably Yoro, and a makeshift Mazraoui at left-back. Mainoo and Tielemans in midfield, Fernandes pulling strings ahead of them. Cunha through the middle, flanked by Mbeumo and Rashford.

It is a team strong enough to win this game. It is also a team that exposes a nagging truth.

United are back in the Champions League, back where they believe they belong. But with Shaw likely out, a teenager too raw to risk, and a winger better used further forward, they walk into Europe’s biggest stage with a patched-up solution in one of the most important positions on the pitch.

If this campaign unravels, no one will need long to identify where the trouble started.