Andre Onana, Alejandro Garnacho and the six Man Utd flops playing for their futures under Ruben Amorim

Andre Onana is a complete liability. Most United fans gave the Cameroon international the benefit of the doubt after his dire debut season at Old Trafford, but now he has no hiding place.

United have dropped so many points because of Onana's mistakes. His positioning and handling are both poor, he doesn't command his box, and even his distribution is falling well below the required standard - which is truly unforgivable given he was initially signed from Inter on the strength of his reputation as an elite ball-playing goalkeeper.

The loss to Tottenham should be the final straw for Amorim. Onana's pathetic attempt to parry Lucas Bergvall's shot away from danger gifted James Maddison the winning goal, and now he must be dropped for No.2 shot-stopper Altay Bayindir, effective immediately. That kick up the proverbial backside may be exactly what Onana needs, and if he doesn't rise to the challenge, it would just confirm he was never cut out for the pressures of life at Old Trafford.

To Alejandro Garnacho's credit, he has at least been putting in a lot of effort for Amorim recently. Since being dropped from the squad for United's derby clash with Manchester City in December, the Argentine forward has shown real character to knuckle down and win back the coach's faith, and with Amad Diallo now sidelined for the foreseeable future, he's the biggest attacking threat remaining in Amorim's line up.

There is one major caveat to all of that though: Garnacho is still an awful finisher. According to Opta, the 20-year-old's conversion rate is the lowest of any player to have 10 or more 'big chances' in the Premier League this season, as he's scored just two times out of 14.

He found himself through with just the goalkeeper to beat once again in the Tottenham game, only to somehow blaze the ball high into the stands when it seemed far easier to at least hit the target. Garnacho's attitude has improved, but his technique still leaves a lot to be desired and he lacks the composure United so desperately need in the final third. If that doesn't change, United will have little choice but to invite offers again this summer for an academy graduate who can generate pure profit on the balance sheet.

It's quite incredible that Diogo Dalot is into the seventh year of his career at United given his glaring limitations as a footballer. The Portugal international has survived largely because of his versatility, providing cover at full-back or wing-back on both sides, but he often stands out as the weakest link and has become an easy target for opposing teams.

Going forward, Dalot is wildly erratic; he tends to either take the wrong option or overhit his passes, much to the frustration of his team-mates. Dalot doesn't redeem himself defensively either, too as he is easily beaten in one-on-one duels and a consistent offender when it comes to letting his marker go.

That was the case once again in the build-up to Maddison's goal for Tottenham, as Dalot gave Son Heung-min far too much space to volley across the box. Dalot is still under contract until 2028, but the 25-year-old has shown almost no growth since his initial arrival at the club in 2018, and United would be wise to try and cash in at the next available opportunity.

Joshua Zirkzee has been unfairly disparaged by pundits and fans alike since his £36 million ($45m) summer move from Bologna. The Dutch forward has ability in spades; he can dribble past multiple defenders with ease and is a natural link-man who is capable of creating something out of nothing.

Zirkzee possesses the elegance and touch of Dimitar Berbatov and the imposing physique of Zlatan Ibrahimovic, and at 23, he has plenty of potential still to unlock. But at the moment, it feels like he is not suited to the intensity of the Premier League.

The slower pace of Serie A brought the best out of Zirkzee, but he's struggled with not being afforded the same time and space in England's top division. Seven goal involvements in 37 appearances is a woeful record for a player with his abilities, and Amorim may decide to move Zirkzee on if he doesn't prove he can make a more decisive impact over the next four months.

United's summer swoop for Matthijs de Ligt never made much sense. The Ajax academy graduate was a big disappointment at both Juventus and Bayern Munich, with his lack of pace and mobility frequently exposed in the biggest matches, and forking out £43m ($54m) for the 25-year-old was an unnecessary risk.

De Ligt has displayed a warrior mentality at times, most notably soldiering on with a bloody head injury during a 2-1 home win against Brentford, but the obvious flaws in his game have not gone away. In Amorim's system, Harry Maguire needs two quick defenders flanking him, and De Ligt just does not fit the bill.

When everyone is fit, De Ligt will be behind Leny Yoro and Lisandro Martinez in the pecking order. The Netherlands international is seemingly fighting a losing battle to make himself indispensable to Amorim amid United's ongoing injury crisis, and if he does indeed fall short, the exit door is likely to swing open when the transfer market reopens.

United's record with No.9s in the post-Sir Alex Ferguson era has been terrible. The likes of Radamel Falcao, Alexis Sanchez and Wout Weghorst all became laughing stocks for their impotency in front of goal, while expert marksmen like Romelu Lukaku and Edinson Cavani were guilty of only delivering the goods sporadically.

But as it stands, Rasmus Hojlund is in danger of eclipsing them all as the worst centre-forward in United's recent history. The club's decision to spend £72m ($90m) on a striker who only scored nine goals in his solitary season at Atalanta has aged horrifically, with Hojlund managing only 12 in his first 50 Premier League outings at United.

The 22-year-old has just two league strikes to his name so far this term, and is currently in the middle of a 14-game barren streak, which is damning enough on its own. But Hojlund can't hold the ball up to save his life either, and he spends more time moaning at his team-mates than pressing.

United can't get back to the top with a No.9 who offers nothing to the collective cause, so he is likely to be the first man replaced in the summer unless he miraculously turns a corner.