All I can say is I have never seen Eriksen play central midfield. And I very rarely seem him in his own half. From what I've seen, and granted it's not as much as an Ajax supporter will have seen, but he looks very Van der Vaart to me, he looks very Kaka, Sneijder-esque. A top, top player, but an attacking midfielder, not a central one. I know Scholes started as a forward for the club and became a central midfielder, so it can be done, but to me that was always an obvious move, as Scholes never had great pace, but always had excellent energy levels, the move to midfield was obvious. But Eriksen? he doesn't look like a central midfielder to me at all. He just doesn't seem to move right for the position. Also, it's a risk to sign a player for so much money, when you have to gamble on whether or not he can adapt to a new role.
If we're going to spend £20 million on a central midfielder, let's buy a central midfielder. Fellaini, Moutinho, Strootman. But if we buy Eriksen? I think we buy him to play as he is, as an attacking midfielder. Dare I say look at Anderson? he was signed as an attacking left midfielder at the beginning, we tried to adapt his game to central midfield, it worked to an extent, but let's be honest, it's proved a costly mistake and we're all still waiting for his breakthrough season. Do we want Eriksen to be that player for us?
I'd sign him though. I'd play 4.2.3.1. With Eriksen, Rooney and Kagawa playing very narrow in the attacking three. The focus on passing, and retaining the ball. Or I'd play him in a 4.3.3 as the attacking midfielder in the central midfield 3. But as an option in a two man midfield? I'd never play him there. Unless we were playing Sheffield Utd in the carling cup.