I'd say we need at least 2 if we're going to play 4-4-2, which seems to be Pardew's preference. The only traditional wingers we have at the moment are Jonas, Obertan and Ferguson, and it's difficult to make a case that any are good enough for the first team.
Ben Arfa isn't a winger. He's great wide in a 4-3-3 but shouldn't be allowed near the wing in a 4-4-2.
Not sure where else he would go