I think we will be Ok in midfield after adding Fred and Pereira to Pogba, Matic, Herrera, McTominay, and Fellaini.
What we need most is a Full Back and a top Right Winger. Sandro and Willian would be nice. But most on here want a CB more than a Full back.
I think a CB would make an immediate improvement with no team disruption beyond what should happen anyway.
A FB has the problem of both causing a blocker to two experienced influential players in Young and Valencia who yes are very much in their last innings, but still offer something, albeit with need to ultimately be replaced, its just a timing thing. They are too old to be sold, unlike other CBs we have.
This mixed in with Shaw is very much last chance saloon. If he can finally prove his worth he is a £25m talent who in todays price would be £50-75 in terms of the level of potential and hype when he was purchased. If he doesn't make it this season he potentially leaves for free. Bottom line either we sold him last summer/ Jan or we have to make it work this time round and give it a good chance to. Jan is still a viable sale window if he can't make it work by then.
Dalot is the newest freshest talent. At 19 it wouldn't be wholy damaging to bring in a 29+ year old right back and expect Dalot to make it in a few years, but then we'd still need to do something with Valencia.
My guess is the RB/ LB is definitely on the cards for next summer, unless of course Young and Valencia continue to keep on running then maybe its one mire year.
In the mean time Dalot/ Shaw should be showing if they are the future or not.
The RW has some similar challenges, not because we have someone there, but we have 3 players who need to be getting regular games on the LW so we really need one or two of them to become flexible and solve the issue, or we need to bite the bullet and lose one.
To some extent if Sanchez doesn't start shining he might need to be the one to go. Would still have some resale value and has the least long term application.
Sanchez was partly brought in to solve the Mhki issue and by doing so we created a new problem, but one who is more marketable and easier to sell with greater value. He also is the type that could be a world class catalyst for fairly instant success. It wasn't a signing we needed, but one that made sense.
Sanchez also shows Martial and Rashford what they need to do to be United players long term and bottom line they either fit in or f off.
So yeah I agree those positions need attention, but timing is crucial. CB is an obvious, easy and logical place to improve with limited upgrade costs if we can sell and buy for the right price.