Manchester United's Left-Back Crisis: A £37m Mistake?

Manchester United have been here before. Same position, same age profile, same uneasy sense that a short-term decision could become a long-term embarrassment.

Two years ago, United let Alvaro Carreras leave for Benfica for around £5.2m. A tidy fee for a youngster, they told themselves. Last summer, they watched him walk into the Bernabeu in a £42m deal to Real Madrid. That one still stings at Carrington.

Now the club stand on the brink of doing it again.

Harry Amass, 19, is the latest left-back to find himself on the auction block. United are prepared to cash in for just £6m, with Championship clubs circling and Premier League scouts taking notes. For a player who has already tasted first-team football and coped with the rigours of a Championship loan, it feels suspiciously cheap.

The timing makes it worse. Old Trafford is crying out for left-backs. Luke Shaw, 31, is entering the final year of his contract, his body already bearing the scars of a decade at the top. Behind him, the depth chart is thin, patched together, and reliant on versatility rather than specialists.

Amass is not a distant prospect. He broke through under Ruben Amorim, featuring seven times for the senior side before heading out on loan to sharpen his game. Those minutes in the Championship were supposed to harden him for United, not for someone else’s long-term project.

Supporters have reacted exactly as you’d expect. Bewilderment first, anger shortly after. The idea of selling one of the club’s brightest academy full-backs for a fee that barely registers in the modern market, at a time when United are actively hunting for reinforcements in that very position, has gone down badly.

The echoes of Carreras are impossible to ignore. Back then, the logic was clear enough: a pathway blocked, a good offer, a chance for the player to play regularly abroad. Then Madrid arrived, the price rocketed, and United were left to explain why a £40m full-back had once been allowed to leave for loose change.

Now, with Amass, the club risk writing the same story again. Only this time, they do it with a squad already short in his position and a fanbase far less patient with missteps in squad planning.

Carrington’s corridors are full of young talent. The club are open to loaning out almost their entire Under-21s squad this summer, hunting senior minutes across the pyramid for the next wave. Four names, though, have been ring‑fenced: Shea Lacey, Jack Fletcher, Tyler Fletcher and JJ Gabriel. They are deemed untouchable.

Amass is not on that list.

That single detail speaks volumes. United see him as a saleable asset, not a cornerstone. For a club attempting to rebuild under Michael Carrick, while also preaching the importance of youth and pathways, it is a dangerous mixed message.

There is still time to change course. A loan, a new contract, a defined role behind Shaw – all remain on the table if United choose to protect their investment rather than cash out early. Because once Amass walks away for £6m, the club lose all control over what he becomes.

They know exactly how that story can end.

The question now is simple: do United finally learn from Carreras, or do they spend the next few years watching another homegrown left-back blossom somewhere else, wondering how they ever thought £6m was enough?