My guess is he's going to invert the midfield. Ring as the only D-Mid. Maxi with Awuah or McNamara pulling the strings.
Please note that I don't think we SHOULD play McNamara, but he's basically one of only two options for that role.
Here's another option. Castellanos can also play as an attacking mid, right? Maybe Dome goes with this:
ITS-Villa-Lewis
----Maxi-Taty---
--------Ring-----
Sweat-Chanot-Ibby-Tinnerholm
Johnson
If we do that, we basically have no attacking subs available aside from maybe Matarrita and Wallace. But it's probably the strongest 11 players we can put out there. Unless you want Mata in the XI, too.