Manchester United have chopped and changed their centre-back partnership over the past couple of seasons with the likes of Rio Ferdinand, Nemanja Vidic and Jonny Evans often interchanging to play in the heart of the Premier League champions' defence. 

The Red Devils somehow managed to win the Premier League last season without a settled back four, which is some achievement. 

Gone are the days when you would know who would be playing in Manchester United's defence week-in, week-out. 

The aforementioned Vidic is on his way out of Old Trafford, while there is a high possibility that Ferdinand and Patrice Evra could follow him out of Manchester United at the end of the season. 

Manchester United's lack of stability among the back four can not be good for the team. David de Gea would probably love to have a settled defence in front of him, so he could build up an understanding and relationship with his defenders. 

The only way De Gea can have that is if David Moyes sticks to his promise by handing Chris Smalling and Phil Jones the chance to impress until the end of the season. 

Manchester United kept a clean sheet on Saturday in the first ever Premier League game in which Smalling and Jones started alongside each other as a centre-back partnership. 

Smalling and Jones have spent the majority of their Manchester United career being shoved at either right-back when Rafael is out injured or as an emergency midfielder - in the former Blackburn Rovers starlet's case. 

The England duo compliment each other well and have worked together in the past - having been part of the Young Lions side that went to Euro 2011. 

Moyes will gain absolutely nothing from playing Vidic for Manchester United's last few games of the season as his heart is obviously not with the English side anymore - while Evans is still struggling with a calf problem. 

The Manchester United boss might as well build for the future by giving Smalling and Jones the chance to cement a place in their side's back four before next season's campaign. 

Former Red Devils manager Sir Alex Ferguson, who said Jones had the potential to become one of Manchester United's greatest ever players, forked out £28million on the duo - so Moyes should surely give them a chance to impress before spending even more money on a new defender. 

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