Never thought I'd hear myself calling for West Ham players to be included in the squad, but Cresswell and Tomkins have had very good seasons, particularly the former. Smalling has never looked comfortable at international level, Cahill is one of those players who only looks good if he's playing alongside a better player, and I think Jagielka is past it tbh. I can't see Tomkins doing any worse than any of them.
But yes, CB is a massive concern. In a real tournament, a team like Germany would've gone 2-0 up with half an hour to go and simply shut up shop for the rest of the game, possibly hitting us for 3-0 as we commit men forward to salvage the game. Not to take anything away from what was a remarkable comeback, but in reality you go 2-0 down at international level, you ain't getting back up again.