Manchester United legend Ryan Giggs believes instability at the top has contributed to their on-field problems.

Giggs says as a club, United simply aren't used to seeing the manager change as much as has happened since Sir Alex Ferguson's retirement.

He told Sky Sports: "Jose Mourinho has obviously got a point about Manchester City buying full-backs for £50m and his comment on PSG being able to purchase so much quality in depth.

“I also think United have struggled with the change of managers over the last few years.

“You've got a mix of players brought in by David Moyes, Louis van Gaal and Jose Mourinho.

“Chelsea and Liverpool are accustomed to that change and it isn't something United are used to.

“Ultimately I don't think United are the team right now that can compete with PSG and Man City.

“It's not that they can't compete financially, but the profile of the players they have are all very different."