Scully - along with Matty Williams - had been told by manager Gudjon Thordarson three weeks ago that he did not feature in his plans and was free to find himself a new club, with the midfielder's contract at Meadow Lane expiring at the end of the season.
Scully has endured mixed fortunes since signing initially on a short-term basis back in February '04 from non-league Tamworth.
The former Irish under-21 star immediately impressed the Meadow Lane faithful with his mazy dribbling runs and tendancy for the spectacular, typified by his wonder-goal against Blackpool shortly after he'd joined.
However, after signing a two-year contract last summer, the Irishman slacked and was swiftly removed from the starting line-up, with his attitude angering both supporters and coaching staff.
He appeared to have turned over something of a new leaf in the summer, losing over a stone in weight and impressing in pre-season friendlies. However, this did not stop Thordarson taking the decision to make him available for transfer, and the Notts boss has not named Scully in the first-team squad for any match this campaign.