The 29-year-old, known as ''Nacho'', arrived on Wearside in January as Poyet invested £3.2million in his services.
Ultimately, it was a gamble which did not pay off as Scocco made only eight appearances and failed to find the back of the net.
Former club Newell's Old Boys have been on his trail for several weeks and on Wednesday night got their man, with a tweet welcoming the Argentinian back to a club he has had two previous spells at.
A tweet from the Argentinian club read: "First of all, a fan of Newell's...welcome @nachoscocco32!"
Source : PA
Source: PA