Sterling off, Kelechi on, Silva moved left and Kelechi behind Bony/Aguero. Would have made a slight change to the formation but at 3-0 there was no risk.Sterling was playing wide of a front 3, Iheancaho would be far more suited to play centrally, however that's where Bony was playing, and where we intended on playing Aguero when he came on. If we'd have Bony and Iheanacho on the pitch together, then Aguero and Iheanacho later on, we'd have needed to adjust the formation, or else play someone in a position not best suited to them. Playing Iheanacho in an unfamiliar position could have done more harm than good to his confidence. Nasri was better suited to the position we needed to fill when Sterling was removed.
I'd have actually taken Silva off, he needs protecting, Sterling needs as much game time with his new teammates as possible.