Stefan de Vrij - Centre half - clear upgrade on Smalling and Jones and Rojo, and should suit the EPL. Will be free transfer in the summer (with lots of signing bonuses of course and agent fees etc etc) but will be tough competition from other clubs.
Seri +Jorginho to replace Carrick and Fellaini (from Nice and Napoli ) - Jorginho will be difficult but not impossible but is more ready to go, Seri will possibly need time to adjust and grow into the EPL, ignoring the Vidal / Kroos gossip but the two I mentioned are gettable imo although again both might have lots of EPL admirers.
Right full back - Fabinho - I know he is now more central midfield for Monaco but he did start there as a full back and can cross pretty well (any crossing ability will be better than Valencia) - but its also possible Fosu Mensah might come back, but not sure where he will fit in (but as he is an academy graduate, wouldn't count for squad anyway I believe) - definitely gettable as he has already spoken about out growing Monaco recently. Even IF F-M comes back we need someone to take pressure off Valencia and it would be too much to ask F-M to do that straight away.
Not suggesting at all that Utd will even get 50% of the above, but any of those would step straight into the 1st XI (if such thing exists any more) and are definitely gettable and as much as anyone can tell, should definitely be top quality additions.
Right wing/ forward - admittedly I have no idea - but one person I don't want is Bale and only because for what he would cost in transfer , agent fees and wages would be way too high a risk with his injury record over the last 2-3 seasons.
Personally I think the players we have should be good enough to be closer to city and if we’d have signed Pep we would have been lvl with city or even top of the league
The main problem is that if / when Pogba or Bailly get injured we have only got "reasonable" quality to step up, rather than world class players, which doesn't help - the quality of the squad as a whole is mediocre and has been for 6-7 years , admittedly not helped by short term deals for Ibra taking up so much £££ and the likes of Lindelof not really getting comfy so far. So when 2 out of 7 deals by JM aren't currently working (Sanchez is too new to properly appraise right now, still obviously getting used to players around him) that's a big "loss".
The attitude at Huddersfield (when Pogba was injured) was awful , but Pogba might have been able to make the difference, and he probably would have directly vs City (I honestly don't think they would have won that game if he wasn't banned, slightly harshly in the Arsenal game) - maybe not in beating City , but even a draw - with Utd winning vs Huddersfield as above- would make a 6 point difference to today's table , which would make it look a lot better than it does now given how much longer City's core players have been together compared to Utd's.