Now that we have found a lineup that is finally working for us, and has consistently produced good/decent performances, we should be looking to tweak the lineup for improvements rather than an overhaul of the formation/lineup. Regardless, we all agree that we need a quality CB who can lead the backline. I'll be very surprised if we don't end up signing Hummels this summer to fill that void, although I have my doubts about whether Hummels could actually be that player for us. Watching our right flank, I couldn't help but notice how much space was created for Valencia (by Mata and Herrera) to get into great crossing positions to deliver a good ball. Obviously Valencia isn't very good at this, so having a fullback who could actually cross would be amazing for us. With Real getting Danilo, we should strongly look into the possibility of them selling Carvajal, even if it is unlikely. Clyne is solid, but probably won't be worth it at the prices quoted.
I do think that we should go for a quality DM to replace Carrick, because we cannot rely on Carrick at his age for the whole season. We really, really should sign Schneiderlin this summer because Southampton are definitely going to sell him, and he's one of the best DMs in the league (and he's just about to enter his peak). Other than that, we should look to replace Fellaini. As good as he has been, I still think he's better off as a rotation/plan B option, rather than a guaranteed starter. He's definitely a good player who has earned the right to be here, but I think we can easily upgrade on him. If we replace him with someone like Pogba, it would improve us significantly (not meant to be a realistic scenario, but an example). Alternatively, we could move Mata into his natural #10 role, and get a winger instead, but I think we'll be worse defensively then (and less balanced in central midfield). That being said, everything points to us signing Depay this summer, so we're definitely getting a winger either way. Depay seems versatile enough to me to be able to play in a more central role, but I'm not sure whether he has the passing skill to play there long term.
---------------------Rooney--------------
---ADM-------------New #10-----------Mata----
----------------------Herrera---------------
--------------------Schneiderlin-------------
Shaw/Blind----Hummels---Smalling----New RB
---------------------DDG--------------------------