it depends on where we are going from, assuming we sign Dybala/Griezmann who will play on right wings and behind a striker or new CM to partner with Pogba and Matic in 433, Ozil looks like he'll sign for us in summer. Ozil is more effective on the right than he'd be on left in 433 and.
in 4-2-3-1 with Dybala/Griezmann, Mhki, Mata, Ozil and Sanchez can play as RW.
Dybala/Griezmann, Mhki, Ozil, Mata, Sanchez and Lingard can play as SS/ACM.
Rashford, Martial, Lingard and Sanchez can play on left.
Considering Lukaku may be untouchable so Rashford, Martial and Sanchez would be a replacement for Lukaku as 9 strikers if needed rest or injured.
Martial, Rashford, Lukaku, Dybala, Griezmann and Sanchez can play as a striker/false 9.
That would increase a depth of our attacking option in the squad, stronger and more competition for a position.