Even if he could, why on earth would you restrict such a creative player to that role.
So that Ramsey would be unleashed and they could easily take turns cycling between attacking and defensive responsibility. Imagine this team
--------Mandzukic
Wilshere---Ozil-----Walcott
-----Ramsey--Fabregas
Gibbs---Kos---Mert-----Sagna
We'd destroy the league.