Rossi was allowed to join the Magpies in August even though Ferguson was left with just three strikers at that time following the transfer of Ruud van Nistelrooy to Real Madrid and Alan Smith's long term injury.
But the promising 19-year-old has made just six Premiership appearances and four of those were as a late substitute.
The player has already said he is unhappy at St James' Park, so Roeder may as well cut his losses if he thought the deal was going to see the player stay for another five months.
No More "Favours" From Man Utd
Ferguson: "Giuseppe will come back to us because he is just not getting enough football at Newcastle.
"The understanding we had with them was that he would play more games.
"Every manager is subject to their own opinions on players, so I don't want to say too much about that. But we could have done with him here, so he might as well come back to us."