I think if we signed Perisic and Fabinho, or 2 other players like them, the team will start to click and pieces will be joined together with our players complementing each other finally instead of the mess happening in the previous years.
De Gea
Valencia - Bailly - Lindelof - Shaw
Fabinho
Herrera - Pogba
Mikhi - Lukaku - Perisic
Subs : Romero - Jones - Blind - Fellaini - Mata - Rashford - Martial
Bailly and Lindelof complement each other pretty well with Bailly doing the dirty work while Lindelof helps in building the attack.
Valencia providing width from the right flank with Mikhi drifting inside as a playmaker, Shaw and Perisic providing width on the left side as they are both good in dribbling with Perisic crossing the ball.
Fabinho and Herrera will do the defensive work in the field letting Pogba rush more forward without worrying and Herrera can complement in the attack well from deep positions through his through balls.
Lukaku will start finding crosses everywhere, Perisic, Valencia and Pogba, he'll get enough chances in front of the goal to score.
The only uncertainty about this team is if Shaw will finally be consistent or not + Pogba and Mikhi will need to rise their goal scoring numbers.
With the right setup, I think the team can very well click finally.
Again it's not dispensable that we get Perisic and Fabinho, any 2 players of the same kind will be fine for me, an anchor DMF and an out and out winger. That's why I said before that Matic won't be really a bad signing as well and will do the job asked for him pretty fine.
Perisic will be a very nice addition to the squad and will balance the team more than anyone expects but we need to get a good and reasonable deal for him or move on to another out and out winger.