Because you've picked 2 players that couldn't be more unsuitable to playing in the wider roles of a diamond midfield. You have got to have runners in those positions - they need to be able to play box to box, at times end up in the right/left wing spot, get back and help their fullback, tuck in and support the holding midfielder. Rooney nor Wilshere can do that.
If you play Rooney and Wilshere either side of Dier then you have to play with wide players that will get up and down the pitch.
If you're going for a diamond then you need a play maker sitting deep (which Dier isn't) and then you have 2 players either side of him doing his dirty work (which Rooney and Wilshere aren't capable of doing).
Wilshere can certainly play that position. He's very adaptable, he was a defensive midfielder when he broke into the Arsenal side, remember his performance v Barca? Whether he's fit enough yet, only the England coaches will know. Rooney, yea, maybe he couldn't but like i said you could give Walker instructions. Dier would just play the same role, there's no where that says that the DM postion has to be the creative force, i'm not sure why you think that. He could just do what he's doing now, nothing would change. You could easily allow the system to be 4-1-3-2 without the ball with Lallana dropping into the central CM position with Wilshere and Rooney occupying the central/wing areas.
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