Marcus Rashford and Anthony Martial:
The young attacking duo already at the club, Rashford and Martial, are among the best youngsters in the world at the moment and this season, they have underutilised at the Old Trafford. With Zlatan occupying the main position, both players have been fighting for one place, on the wing, and they have not been able to effect the game as they would have liked. Yet, they have excelled in that position as asked by their manager and are showing signs of improvement. They will not take long to turn into world-class players but they will need some regular game time to get there. So Mourinho is well advised to stick with them next season rather than spending big in the market.
Lack of options:
There are very few names in the transfer market that are ready to move and can walk into the first team at the Old Trafford. Antoine Griezmann, Pierre-Emerick Aubameyang and Robert Lewandowski, are among the best players in that position in Europe and United have been linked with a big-money move for each of those players in the past. They will surely have to break the world record for transfer fees yet again to land at least one of those names and it is something that United can avoid at the moment. They need a world class player who can take them to the top but if Mourinho can get all his team to play at their best, they already have a team strong enough to beat the best in the game.