You can keep your mitts right off Stephen McGinn. I'm not sure anyone else would fit the bill, in all honesty. We've got Kyle Magennis, too, but he's on a three year deal so you'd have to seriously cough up for him.
In terms of ex-players, there's Kyle McAllister at Derby - very highly rated, but has had injury issues since he went down there 18 months ago. Can't see him getting a look-in with the players Lampard is bringing in now, so I reckon he'll be on his way back up here sooner rather than later.
This is him: