When you try to think of the strongest team it's difficult to do, definitely need signings.
As Blind is probably currently the best option at centre-back, left-back and holding midfield. As Smalling is the only other competent centre-back the now with Bailly injured. Shaw at left-back reminds me a bit of Phil Neville, not bad defensively but not good, not bad going forward but not good, not slow but not fast, not a bad user of the ball but not good everything just pretty average about him. Blind at least has good passing ability and vision and a good cross and better movement. Holding midfield there's nobody really, Blind is weak there but still better than the other options.
Out wide there are no options either, the 3 better attackig midfielders Pogba, Mata and Mkhitaryan all prefer playing in the middle of the park. Rashford and Martial are not wide players, certainly the type who Ibrahimovic like to feed him who get crosses in.
Everything still out of sync from defence to attack after years of trying to fix it, still 4 or 5 players away(centre-back, defensive midfielder, centre-mid and 2 wide players).