We really should have put a buyback clause in Zaha's deal. He could surely help us when we need pace on the counter and maybe platoon with Mata (who could play against packed defences) to give us an effective set of players competing on the right.
With Fred being bought and Pereira now in the first team, it's tough to see Lingard getting too many games centrally, this would have been a good year to send him on loan somewhere to sweeten a move for a starting quality RW, and then when one of or both of Herrera and Fellaini go next year he could come back and be our most attacking central midfield option backing up Fred and Pogba.