I see Marveaux (if he manages to regain fitness, which is far from certain) more as a wide player in a 4-3-3 than as one of the three central midfielders, where we need a more physical player if you ask me. Also, we could do with more goals from midfield and a dead ball specialist, all of which would be resolved by bringing in Sigurdsson. Besides Ben Arfa and Marveaux we've got Ba (I know), Jonas, Obertan, Ferguson and Sammy for the wide positions, so I'd say we're well stocked there.