Not that long ago we had some great games with a Casemiro, Eriksen, Bruno midfield. If we pick his games, let him play the cup games in Europe and against lesser teams, I think he could still bring something to the table. I could also image EtH may still play Mount in that position. He played there against Rosenborg.
Of course, I'd prefer we'd just buy a specialist 8 with legs to relieve Mainoo off some pressure. But I can understand that a DM, a LB and maybe even another CB are higher up on the priority list.