The French international has joined Roma after an initial loan spell.
"Newcastle United defender Mapou Yanga-Mbiwa has completed a transfer to AS Roma after meeting a contractual condition contained in the loan agreement between the clubs.
"The French defender joined Roma on a loan deal in September 2014 but it has now become a permanent move."
Yanga-Mbiwa arrived at the club from Montpellier in January 2013. Two years on however he has been moved on, as one of the failures of Newcastle's continued quarrying of French based talent.
Newcastle United FC (@NUFC) January 27, 2015
When they snapped him up, Sky Sports reported it was for a fee of £8.5 million, he signed a five-and-a-half year deal, so he was expected to be around for a long time.
But he never truly found anything like his best at St James Park. He was often found out for his lack of attention and concentration. It saw him not trusted at the heart of defence for much of his time at Newcastle, playing at full-back on numerous occasions.
So he was loaned out to Roma in September and has been a hit in Italian football, leaving Newcastle happy for the Gialorossi to exercise their right to buy the player outright.
It is doubtful that Yanga-Mbiwa will be greatly missed by Newcastle fans, but his potential certainly will.