Jesus mate, that's optimistic.
Sanchez is completely shot. His confidence is gone. Dier ain't very good. Neither of them are ball players so that is a problem in Ange's system.
Lenglet is outrightly garbage. He came in as some sort of famed distributor but is in reality pretty limited, has no courage, is easily moved off the ball and lacks any sort of defensive awareness. He's one of the worst defensive players I have seen in a long time and if we sign him on a permanent deal then it will be only because Levy is still shopping at Poundland for players.
We need 2 new (quality) CB's, at a minimum we need one who is a ball player and can compliment Romero.