Manchester United's Defensive Gamble: Carrick's Centre-Back Challenge
Michael Carrick knows the numbers. Five centre-backs. Four competitions. One season that could define his future at Manchester United. On paper, it looks like depth. In reality, it feels like a tightrope.
Leny Yoro, Ayden Heaven, Harry Maguire, Matthijs De Ligt and Lisandro Martínez form the spine of Carrick’s defence, a group that blends youth, scars and medals. It should be reassuring. It isn’t. Not when the manager is heading into his first full campaign with no clear plan to reinforce at centre-half unless someone leaves.
This is the gamble: is this a carefully constructed mix of exuberance and experience, or a fragile core waiting to crack under the strain of a season that stretches from Hull away in August to who-knows-where in May?
Carrick’s step into the real thing
Carrick eased himself into the job last season. He arrived as the calm after the storm, stepping in when Ruben Amorim was sacked in January, with United already out of the domestic cups and Europe. Seventeen league games. A short, sharp audition.
He passed. United finished seventh on 32 points, nine behind Aston Villa in third. The chaos and angst that had followed Amorim’s departure faded. The team became hard to beat. In those 17 matches, they lost only twice – 2-1 at Newcastle and 2-1 at Leeds – and conceded 18 goals. Functional. Organised. Controlled.
Now comes the real test. Carrick’s United return to the Champions League after a two-year absence and will compete on four fronts: Premier League, FA Cup, Carabao Cup and Europe’s top table. The schedule thickens. The margin for error shrinks. And those five centre-backs move from an asset on a squad list to a weekly anxiety.
Youth with promise – and question marks
The romantic idea is clear: Yoro and Heaven as the future, growing into the roles while learning from the hardened professionals around them. The reality is less simple.
Yoro is only 20 but already the more seasoned of the two, with 66 appearances since his £52m move from Lille in 2024. He has the frame – 6ft 3in – the pace, and a calmness that hints at a long-term anchor in the backline. Yet the occasional error still creeps in, the kind that gets punished at the highest level. After two seasons, this has to be the year he stops looking like a prospect and starts performing like a pillar.
Heaven, at 19, is even earlier in his journey. Signed from Arsenal in February 2025 for a nominal fee, he made 11 league starts last season and impressed in flashes. At 6ft 2in, with a strong build, speed and good technique, he looks like a modern centre-back sculpted in a data lab. But he knows his place in the hierarchy. “I’m young and I’ve got to be patient, especially in my position. You don’t see a lot of 19-year-olds playing week in, week out. I know it’s nothing personal. I’m waiting for my opportunity,” he says.
Patience is admirable. United’s fixture list may not allow it. If injuries bite again, Heaven’s “opportunity” could arrive in the white heat of a Champions League night rather than a gentle home game in the league.
Maguire, Martínez and the cost of fragility
At the other end of the spectrum stands Harry Maguire. Thirty-three now, the former England defender brings nous, bravery and a willingness to take responsibility. He has lived through the full emotional range at United: captaincy, criticism, revival. He remains one-paced, though, and in a high line or against elite movement, that limitation can be brutally exposed.
He was left out of the World Cup by Thomas Tuchel, a decision that underlined how far his stock has fallen at international level. Yet at United, he still offers leadership and experience of winning; he played his part in the 2024 Carabao Cup triumph and understands what it takes to get over the line in big games.
Under Carrick, Maguire would expect to start the season as first-choice, likely alongside Lisandro Martínez. On paper, that partnership makes sense: Maguire’s aerial dominance and Martínez’s aggression and front-foot defending. On grass, there is a recurring problem – Martínez’s body.
The Argentinian, 28, remains plagued by injuries. He limped out of the World Cup final defeat by Spain before half-time with a muscle issue, another line on an increasingly crowded medical record. His availability for the opener at Hull is already in doubt.
When he does play, he transforms United. In the 2-1 win over Manchester City in the 2025 FA Cup final, he was immense. Pep Guardiola rated him “a top five centre-back in the world” afterwards, a rare compliment from a manager not prone to empty praise. But Carrick cannot build a season on hope and tape. Martínez’s quality is beyond debate; his reliability is not.
De Ligt and the big unknown
If Martínez is a concern, De Ligt is an even bigger one. At 26, he should be entering his prime years, anchoring the defence with the authority of a man who has already lifted league titles with Ajax, Juventus and Bayern Munich. Instead, he has become a medical bulletin.
He has not played since the 2-1 win at Crystal Palace on 30 November, his season wrecked by a back problem that finally required surgery in May. After the operation, he spoke of pushing himself in every session since November, trying everything to get back to the pitch and to “doing what I love, playing football.”
The plan is for him to return early in the new campaign. Plans, though, are not guarantees. Back injuries are notoriously tricky, and until De Ligt strings together a run of games, Carrick will be managing not just a player, but a risk.
When you lay it all out – Yoro still learning, Heaven still waiting, Maguire slowing, Martínez breaking down, De Ligt rehabbing – the picture is stark. This is less a defensive unit and more a puzzle that needs solving every week.
Rivals spend, United hesitate
The uncertainty at the heart of United’s defence is thrown into sharper relief by what is happening elsewhere. The clubs they want to compete with are not standing still.
Manchester City have gone big, bringing in Eliott Anderson for £116m. Chelsea have responded with Morgan Rogers at £117m. Tottenham have thrown their weight behind a rebuild, signing Sandro Tonali for £100m and Mateus Fernandes for £85m. These are statement moves, the kind that reshape midfields and dressing rooms.
United’s own recruitment looks modest by comparison. The headline arrival so far is Youri Tielemans, 29, from Aston Villa – a smart, experienced addition in midfield, but hardly a transformative signing. Andrey Santos, 22, joins from Chelsea with only 11 league starts to his name last season. Useful pieces, potentially. Not the kind of business that calms a manager who already wonders if his defence is built on sand.
There are still five weeks left in the transfer window. That matters. Squads can change quickly, and one decisive move at centre-back could alter the mood around Carrick’s project.
For now, though, the reality is blunt. Manchester United are preparing to fight on four fronts with a central defence that feels more like a question than an answer. As the season looms, the issue is no longer whether Carrick can organise a backline. It is whether this backline, as constructed, can survive what is coming.
