No chance he'll start over Bruno. However, I do think we got a taste of how ten Hag could potentially line-up in the ''important'' games against Real, with Bruno out wide and Mount pushed up. That leaves a space in the pivot position for a more defence minded player. Last season it was Fred. ten Hag played Mainoo next to Casemiro against Real, but unfortunately he got injured early on.
We've been linked with Amrabat, but he doesn't strike me as someone who could play next to Casemiro, but moreso someone who could debutise for him.