Manchester United's £3 million left-back has been left out of the first-team squad, raising fears that the transfer is a failure. British media claims he has no future.

During the Red Devils' second warm-up match, teenage English left-back Harry Amass shone brightly, setting up a goal and netting one himself. The ex-Watford talent, previously dubbed the "heir to Luke Shaw," could potentially break into the senior squad as a substitute this season. But his display has left fellow 19-year-old Paraguayan Diego León in an awkward position.

Amass was born on March 16, 2007, while León was born on April 3, 2007. They are almost the same age, but Amass is ahead in development, suggesting that León may have no future at the club. United recently called up Dan Amour, Jayden Kamason, Jim Sweitz, Jacob Devaney, Ethan Williams, and even 15-year-old Gabriel to the first-team summer training camp, but León was not included.

United spent £3 million on his transfer fee, with an additional £4 million in potential add-ons, but León has yet to make his first-team debut for Manchester United. The British tabloid *The Sun* claims that León is destined to become a failed transfer of the 2025 summer window. In fact, not only has he not played, but he hasn't even trained with the first team this year, indicating that Carrick does not rate him. Data shows that the last time León was included in a senior matchday squad was back in October last year.

United may even sign another left-back this summer. Transfer expert Ben Jacobs reports that with Rashford staying, Carrick is more likely to bring in a left-back than a left winger. Newcastle's Lewis Hall and Fulham's Antonee Robinson have been consistently linked with the Red Devils.

If United indeed do this, especially by signing a young full-back like Hall (only 21), it would be another blow to León. Given his age, the chances of him getting an opportunity at Old Trafford seem slim. Carrick has many options at left-back: Luke Shaw, Amass, Patrick Dorgu, Diogo Dalot, and Mazraoui—there is simply no room for León.

León is currently training with United's U21 squad in Germany and played in a friendly against Nürnberg. His refusal to go out on loan is considered a mistake. British media believe the Paraguayan youngster should have gone to the Championship or even League One to truly adapt to English football and gain competitive experience, rather than staying in the comfort zone of Carrington, playing youth matches with low intensity.

Unfortunately, León has rejected loan moves twice. The first time was right after joining, when he confidently stated that he didn't want to be loaned to another club and claimed he would be playing with the first team in a few weeks.

Clearly, that hasn't happened. However, in the January winter transfer window, León again rejected a loan move. United had wanted him to join Sir Jim Ratcliffe's French club Nice, but León and his agent believed the club was in turmoil and not suitable for his development, so they decided to stay again.

In contrast, his rival Amass was loaned out twice last season, first to Championship relegation battlers Sheffield Wednesday and then to promotion-chasing Norwich City. Although he eventually suffered an injury that ended his season early, he has gained far more experience than León.

Many believe that under Ten Hag's management, Amass should have had a chance to prove himself, but the Dutch coach thought his physique was not strong enough. Two years later, his body is noticeably more robust. Ironically, last season, it was precisely León's arrival that forced Amass to leave United on loan, and now he seems to have benefited from it. Amos has reminded Carrick through his performances not to forget him when considering Luke Shaw's understudy.