Jadon Sancho, Christian Eriksen and the 10 Man Utd players with points to prove in pre-season

Sancho has shown only glimpses of his true quality in two inconsistent and sometimes troubled seasons with United since his £73m ($94.4m) move from Borussia Dortmund. It has to be a case of third time lucky if he wants to get out of this downward spiral and resurrect his United career.

After being removed from the squad to work on his fitness and mental state midway through the season, Sancho showed flashes of brilliance when he returned in February, looking sharp and effective against Tottenham, Leicester and Chelsea.

But too often he looked afraid of taking risks, going through matches without doing anything of note. He will not be able to do the same in his third campaign, especially after the arrival of Mount, and he must hit the ground running in pre-season.

The Danish international brought vision and balance to United and formed Ten Hag's best midfield trio with Bruno Fernandes and Casemiro. But as the campaign wore on he began to struggle and was usually the first player to be substituted.

He was particularly weak in the FA Cup final defeat to Manchester City, lacking intensity and energy when United needed it the most. Mount's signing also puts him under pressure and he will need to show Ten Hag that his stamina has improved over the summer.

Martial does not have to prove his ability to Ten Hag and the manager was keen to stress throughout last season that the French forward had played his part in some of United's best performances and results.

But he does have to prove his fitness after missing 34 matches in all competitions due to injury. He sustained a total of four injuries over the season, being absent for around 10 weeks between January and April and then hurting his hamstring the week before the FA Cup final.

His fitness troubles underlined United's need to add a striker to their squad and even though there is no sign of another centre forward arriving imminently, Martial needs to demonstrate he can play 90 minutes without calling for the physio. He is not in the squad to face Leeds but it is paramount that he goes on the tour of the USA and makes a substantial contribution.

Maguire started just eight Premier League games last season, slipping into an existence as the team's fifth-choice centre-back. The return of Lisandro Martinez, who missed the last two months of the season, puts extra pressure on him to perform.

The England defender has been training hard over the summer. While he could have been lounging on the beach, he has instead been working on his fitness with Ricardo Carvalho in Portugal.

Reports that United are not willing to sell Maguire for less than £50m ($64.7m) indicate he could be staying at Old Trafford next season and might get another opportunity to show Ten Hag what he is made of. Once he joins up with the squad in the States (he is not due back in training until next week) he has to prove to his manager he is worth keeping around.

The Ivorian had a sizzling season on loan at Sunderland and returns to United with an enhanced reputation and renewed confidence. Another loan move to a top-flight club is an option for the coming season, but he has a golden opportunity to show Ten Hag he is good enough to stay and fight for a place in the team.

Antony, Alejandro Garnacho and Anthony Elanga have not travelled to Oslo, meaning Amad is likely to start against Leeds. The Championship side are ideal opponents for him to show how much he has grown in the last year and to prove he can repeat his heroics for Sunderland with United.

Van de Beek has had three torrid seasons with United since his £40m ($51.7m) move from Ajax and not even the arrival of his former coach Ten Hag has been able to ignite his career at Old Trafford.

The midfielder suffered a terrible knee injury in January which ended his season and he now has the added challenge of proving his fitness as well as his ability. The Dutchman might not be able to regain his place in Ten Hag's first team but he could at least show watching clubs that he is worth taking a chance on so he can put his difficult spell at United behind him and rebuild his flailing career.

Like Amad, the Spanish defender had an excellent year on loan at a Championship club and was named Preston North End's young player of the season.

Another loan move looks to be on the horizon for the 20-year-old but a solid pre-season could convince Ten Hag to keep him on and challenge Tyrell Malacia as second-choice left-back.

The Stockport-born midfielder made his first-team debut aged 17 and, after getting a taste of the action, now is the time for him to kick on.

United are short of options in defensive midfield beyond Casemiro, especially if they decide to cash in on Scott McTominay and Fred in order to fund a move for a striker. Despite making only three first-team appearances, Mainoo will be one of United's most experienced midfielders against Leeds and it is the perfect opportunity for him to show he is ready to make the step up and play more often.

The sudden departure of David de Gea made United look heartless as well as indecisive, but while the club tries to pull off a deal for Andre Onana, the No.1 spot is up for grabs for the next few weeks.

And Kovar could be the man to take it. The 23-year-old has been with United since he was a teenager and has just had his first taste of silverware after winning the Czech title while on loan at Sparta Prague last season.

Martinez was one of United's most influential players last season until his agonising injury against Sevilla in April. The Argentine fractured his metatarsal and had to be carried off the pitch by two opposing players.

It is a tough injury to come back from and while there is no doubting Martinez's ability, it is vital that he gets back to match fitness and is up to full sharpness by the time the league season starts in August.