Right Wing Forward - Juan Mata

The right-wing forward role has been Manchester United's Achilles heel for a few seasons now. United do still lack a proper right forward and while Solskjaer has used quite a few players in the role, it is perhaps Juan Mata who could be extremely effective in the position, courtesy of United's front three's insistence on being extremely fluid and swapping positions regularly.
The Norwegian does have the option of using Mason Greenwood or Daniel James in the role, and in such a case, Mata could tuck into the central attacking midfield position while one of those two play in the forward role. However, having Mata in the team does give the Norwegian quite a few options.
The Spaniard, who loves playing through the middle, will most definitely interchange positions with the central attacking midfielder. Mata could start in the right forward role and then switch positions centrally with Lingard, who has been preferred in the central attacking midfield role in preseason due to his relentless energy which aids United's attempts to press from the front.
The Spaniard might be lacking speed, but his vision and passing range, coupled with his qualities on the ball, make him a dangerous proposition, especially with all the speed around him in the team. His ability to pick a pass and thread those inch-perfect final balls could actually be an asset in the team. Mata's tendency to drift inside from the right will also open up spaces for Aaron Wan-Bissaka, who has been good whilst bombing down the right flank for United in preseason.
Perhaps the biggest benefit of having Mata in the team is the experience that comes with the inclusion of the Spaniard. Needless to say, the young United attack line is a little short of worldly wisdom that comes with age, and Mata's inclusion could provide certain stability and composure that will complete the team.