Marcus Rashford says he wants to play as a number-nine, and essentially told the football world: ‘you aint’ seen nothing yet’. Strikingly self-assured, the 19-year-old says the fact he has only been a Manchester United and England first-team player for just over a year means there are a lot of qualities to his game that haven’t been illustrated yet - like how he scored his first set-piece goal, in the Europa League against Celta Vigo.

Rashford still believes that playing on the left has aided his development as a more complete player and, amidst United’s pursuit of a top-class number-nine, is evidently willing to wait to play in the centre for Jose Mourinho.

The forward feels he has earned the trust of the manager, and praised him instrumental in his progress for the way he gave him responsibility.

How Manchester United could line up next season Show all 12 1 /12 How Manchester United could line up next season How Manchester United could line up next season How could United line up? Jose Mourinho's side have been linked with dozens of new signings, but who is most likely to line up for the club in time for the start of the 2017/18 season? Getty How Manchester United could line up next season Goalkeeper – David De Gea Reports in Spain now suggest De Gea will stay at United once again as Real Madrid have failed to convince the club to sell. Getty How Manchester United could line up next season Right back – Serge Aurier Serge Aurier is believed to be in advanced talks with Manchester United ahead of a £25m move to Old Trafford. However visa issues are delaying the move so far. Getty How Manchester United could line up next season Centre-back – Eric Bailly Bailly had a phenomenal first season at United and looks like he will be the bedrock of Mourinho’s defence for the foreseeable future. Getty How Manchester United could line up next season Centre-back – Victor Lindelof Victor Lindelof has joined the club from Benfica and will start in the heart of United's defence. Getty How Manchester United could line up next season Left-back – Danny Rose Danny Rose is pushing for a move north and Manchester United are known to be interested in the left-back as Luke Shaw's future grows even more uncertain. Getty How Manchester United could line up next season Midfield - Ander Herrera A fan favourite at Old Trafford, Herrera's tenacious performances in the middle of the park last season saw his stock rise immeasurably. With Wayne Rooney's days numbered, the Spaniard may be in line to take the captain's armband. Getty How Manchester United could line up next season Midfield – Nemanja Matic The signing of Matic is one that screams not only of the need for discipline in the heart of this United team, but one that reiterates how the Portuguese is looking for players who can help him win now, not a couple of years down the line. Getty How Manchester United could line up next season Midfield – Paul Pogba Mourinho is known to want to bring in a defensive midfielder in order to free up the Frenchman to operate further up the field. Getty How Manchester United could line up next season Left-wing - Marcus Rashford The young English forward has done enough to earn Mourinho's trust and should be used in the first XI far more next term. Getty How Manchester United could line up next season Right-wing – Ivan Perisic United are only willing to spend £35m on Perisic but Inter want £50m. The club are still confident they can push the deal through. Getty How Manchester United could line up next season Striker - Romelu Lukaku Mourinho has prioritised a new No.9 this summer following Zlatan Ibrahimovic's season-ending injury and subsequent release and has opted for Lukaku as his top choice. Getty Images

“Of course it’s to play down the middle,” Rashford said of what position he prefers. “But playing on the left creates a different picture in your mind. It’s what’s needed to play down the middle. It’s all a process and if I keep buying into it and learning from it, hopefully everything will come through when I’m playing in the number-nine position.”

Asked about how Mourinho had given him set-piece duties, Rashford said it reflected the trust of the manager, but also allowed the player to display a lot of faith in himself.

“It’s about taking responsibility for certain moments,” Rashford said. “That just shows the manager making me take more responsibility. For the player, it is a good feeling when he gives you those type of duties. All I have do is keep practising and keep practising and keep practising to score more and create more.

“You have only seen me playing for one year and there are a lot of things you don’t know about me and what you have got to learn, what I have got to learn about myself. It’s just a start.”

Rashford meanwhile went on to further praise Mourinho, after a season that has seen a lot of debate about the Portuguese despite winning the League Cup and Europa League.

Rashford is enjoying working with Mourinho (Getty)

“A lot of people have a lot of opinions about him, but what he's done is clear. It's not all what people say. I've obviously played a lot of games under him this year and I've earned his trust, which is important for me and it's got me to where I am now.”

Rashford’s game appeared to go up a level when replacing Zlatan Ibrahimovic in the centre for United’s run to the Europa League, after the Swede got injured in the competition quarter-finals against Anderlecht.

“If you don’t believe in yourself, you can’t expect other people to believe in you. I was confident going into the games and I think it’s just another step you take individually. Taking on the responsibility of being in that role is something you take pride in.”

Further displaying his maturity, Rashford was one of the players who decided the United squad should visit victims of the Manchester Arena bombing in hospital.

"It was basically up to us,” the 19-year-old said when asked. “It was in our spare time. We weren't doing anything, so we thought, 'Why not?' It's something we wanted to do, but didn't have time to do when the season was still going on. As soon as we had time off, we thought it was important that we went and did it. You feel proud, being able to make a difference. If you can make a difference, I think it's important that you do. Going there and just seeing some of the victims just smiling and having a laugh, it gives you a good feeling and you want to recreate that moment as much as you can.

“Friends of friends were affected. Manchester is a small place and it was more than likely I was going to know someone affected. But it doesn’t just go out to those people, it goes out to all the families.”

United and England teammate Chris Smalling feels there is no limit to what Rashford can achieve, and similarly said that the young forward has abilities that haven’t yet been seen by the public.

“The world is his oyster,” Smalling said. “He can be one of the best. You get forget how old he is, how few games he’s played. But as a player he’s got everything. He’s quick, he’s strong and his temperament is fantastic. He can do skills as well, not that you see skills in the game, he’s a kid who wants to play football whether he’s in his room or in the changing room, kicking balls, knocking things over. He's a fantastic talent and I’m glad he’s on my team.

“I think it’s that pace and movement, he constantly wants to run in behind. Gareth [Southgate] here and Jose want that striker who constantly runs in behind so it keeps you on your toes.

Manchester United summer transfer targets Show all 8 1 /8 Manchester United summer transfer targets Manchester United summer transfer targets Ivan Perisic, Inter Milan United want to spend £35m on Perisic but Inter are holding out for closer to £50m. That said, Mourinho is a big fan and may be willing to go the extra mile to get him. Likelihood: 7/10 Getty Manchester United summer transfer targets Renato Sanches - Bayern Munich Sanches was being chased by United before deciding on Bayern Munich last summer but is back on their radar again 12 months later. He is available for £43m and Ancelotti has admitted United are "a possibility". Getty Manchester United summer transfer targets Fabinho - Monaco An extremely versatile player Mourinho sees him more as a defensive midfielder and could be used to give Paul Pogba, last summer's big addition, more freedom. Monaco aren't in any rush to lose any more first team stars this summer though and are likely to demand a hefty fee. Likelihood: 7/10 AFP/Getty Images Manchester United summer transfer targets Eric Dier - Tottenham United have already had a bid less than £25m rejected for the defensive midfielder and know they must more than double it to have any hope of signing Dier, who is understood to want the move. Getty Manchester United summer transfer targets Nemanja Matic - Chelsea Nemanja Matic has twice worked under Jose Mourinho before and he wants to make it a third time at United. However, after beating Chelsea to Romelu Lukaku, relations between the two clubs have been soured somewhat. Getty Manchester United summer transfer targets Gareth Bale - Real Madrid The Real Madrid forward would be a marquee signing, the type that the Manchester United boardroom are keen to make, and The Independent has been told by sources from both United and Madrid that a deal is 'much likelier' than ever before. The player himself though is happy in the Spanish capital. Likelihood: 5/10 Getty Manchester United summer transfer targets Willian - Chelsea Mourinho is a huge admirer of Willian, who he signed in 2013 while at Chelsea. The pair won a Premier League title and League Cup double together the following year and it is believed that the United manager will do his best to sign the player, who has not been a regular starter in Antonio Conte’s system. Whether Chelsea will allow him to leave, particularly to join Mourinho at their rivals is yet to be seen. Likelihood: 4/10 Getty Manchester United summer transfer targets Andrea Belotti - Torino Another of Europe’s most promising players, Belotti is fast becoming well-known after his outstanding performances at Torino, where he has scored 37 goals in 64 appearances since 2015. His best years are still ahead of him aged just 23, which contributes to the incredible €100m release clause, applicable only to clubs outside of Italy, negotiated into his contract. Torino are in no hurry to sell and will drive a hard bargain with any deal likely to start at upwards of £70m. Likelihood: 7/10 Getty