Oh god. I tried a couple of times but it's difficult.
I think I'd start with Courtois in goal. And then, Trippier or Pavard at right back? I can't seem to think of any particularly great left back in this tournament. Then in attack, I'd like to be able to include someone like Cheryshev, but at the expense of who? Haha. This is too difficult, I'll give it a try later though.
The nailed on players in my eyes are Courtois, Varane, Kante, Modric, Hazard and Mbappe.