There is certainly enough cover for the wing back positions. I don't get what Delph is doing there. Is he there as a wing back or as a midfielder? Either way I don't get it.
Also when you have a squad of 23 players, which is quite a big squad for a tournament where you play a maximum of seven games, why not fill the squad with players with different qualities. You can afford to take a gamble on Adam Lallana who might not be fully fit, or even players like Jonjo Shelvey or Jack Wheelchair (who I don't like and think is overrated, but still has something a bit different to offer than the other midfielders in the squad). What the hell is Fabian Delph going to offer from the bench if you need something a bit different.
I'd even consider picking Andy Carroll for a squad like this. He's not a world class player, but he is world class in the air. You might be in a situation where you are desperate for a goal, but can't create chances the way you normally play. Throw him on, put a few crosses into the box and something might happen. He could be a game changer because he has outstanding qualities in one area of his game. I'd rather pick someone like him than just another decent allrounder.
Rose is lucky to be there on the basis of this season. I would have thought Bertrand was ahead of him now.