Xavi and Barcelona are making a mockery of Manchester United's constant attempts to rebuild

Manchester United are facing another transformational summer as they consider who will lead the club for the medium to longer-term with the likelihood being that incumbent manager Ralf Rangnick will move upstairs at the end of this season to work in conjunction with John Murtough.

Rangnick's arrival in itself came after United's latest attempt to rebuild Solskjaer failed. The Norwegian's position had become untenable after a series of desperate results and the club turned to Rangnick to salvage the rest of the season.

But the close season will see United attempt to start again and all signs point to the club being willing to spend the money required this summer to recruit a number of players in a bid to support their new manager.

But after a series of failed rebuilds under Louis van Gaal, Jose Mourinho and now Solskjaer, United need to be certain of this appointment and build a lasting project, rather than look towards any sort of short-term fix, regardless of what the end of this season brings. They can not afford to spend any more time out of the spotlight while making limited progress towards returning to it.

United have seemed reluctant to revolutionise and completely rebuild the club since the conclusion of Sir Alex Ferguson's era and it has shown in their football on the pitch across several different regimes but there is hope that the appointment of Rangnick is a step in the right direction.

If you want an example of a serious rebuild project, however, Barcelona are the classic case study right now of how to go about starting again under the tutelage of Xavi.

Barcelona's collapse from the top was sudden but of their own making, as the club financially crippled themselves with big contracts and exorbitant transfer