I'd be more than a little concerned if he came back. If he comes back it needs to be newcastle paying his wages or a seriously low cost to us, it would be a waste of the tiny resources we have if we spend any money on Bigi. Better quality if needed as our current defense and midfield are barely a skeleton of a team we need to be competitive.
When he played last season he was lightweight, looked to have little to no forward vision whatsoever, passed the ball as often forwards as Fleck did in the back half of the season. Then hes played as a defensive mid and can barely make a tackle, muscled off to easily and too often out of position. Albeit that was a team-wide issue much of the time.
Personally, I'd rather not take him at all and wait in hope we get someone else with the money. Thats making a bold assumption we aren't already at our wage budget...