The club have told fans why they let the defender go so late in the transfer window.
The defender was allowed to leave the Mapgies late in the transfer window, moving to the Serie A side on loan despite Alan Pardew not having time to line up a replacement.
Many have since questioned the decision, although his involvement in Roma's 7-1 thrashing at the hands of Bayern Munich seems to have given the move at least some credit.
At a Fans Forum, meanwhile, the club revealed exactly what the thinking behind allowing Yanga-Mbiwa to leave St James' Park with a view to a permanent deal was.
“The move was sanctioned in the interests of all parties," they said. “There is the possibility that the transfer could become permanent at the end of the loan period at around the fee Newcastle United initially paid for him.
“The club added that it had initially reached a verbal agreement for a replacement defender in the summer.
“Because the deal with AS Roma took longer than expected, the replacement transfer was no longer possible.
“The club’s view was that the deal to allow Mapou Yanga-Mbiwa to leave was in the interests of all parties and, after taking the medium-to-long term view, the club let him leave.”