Newcastle United have struggled at centre-back this season.
Newcastle United's season is still being impacted by an error that Alan Pardew made during the summer.
Pardew, who is now in charge at Crystal Palace, decided to loan out Mapou Yanga-Mbiwa to Roma in the previous transfer window and it is hard not to see that deal as a mistake now.
At Roma, Yanga-Mbiwa has largely done well - playing 18 times and helping the Serie A side into second place in the Italian top division.
It shows how much class he has and, although it would be wrong to suggest he would be a sure-fire fix for the Magpies, he would certainly be an upgrade on their current options.
Yanga-Mbiwa has struggled to adapt to English football since arriving in the January of 2013, but his quality is undoubted.
The powerful centre-back has impressed in both France and Italy, and Newcastle may have been rewarded by showing a bit more patience in him.
This season the club have had to use Paul Dummett and Mike Williamson in the centre of their defence on numerous occasions and Yanga-Mbiwa surely would have been a better option than either of the pair.
Dummett may be a passionate player, but he is a full-back by trade and has struggled in the heart of the defence.
Williamson, meanwhile, looks far short of the quality needed to represent Newcastle at the top level and his sluggish performances have frustrated fans of the North East club.
It is hard not to think that whoever takes over at Newcastle would like to have Yanga-Mbiwa available to him and, although Pardew may have lost faith in the Frenchman, there may still be hope for him to turn his St. James' career around.
In the immediate future, however, Newcastle are going to have to continue to watch a player who could have helped some of their current defensive problems ply his trade elsewhere because of a misguided decision Pardew made during his time in charge.