Manchester United manager Jose Mourinho must get the best out of Paul Pogba, Marouane Fellaini and Morgan Schneiderlin – or he should sell them. That is the stark warning from Old Trafford legend Gary Neville, who has claimed that United's expensively assembled midfield has yet to click under Mourinho's guidance.

United have spent around £150m ($182.8m) to bring the trio to the club over the last three years, including a world-record transfer fee for Pogba. But Neville is frustrated by their lack of impact for the Reds.

"I have to say when I look at United I still don't know what their best XI is. Mourinho is still early in his reign, he is identifying his best players, his best XI, his best partnerships," the former United captain explained to Sky Sports.

"To be fair, United have to trust him and will trust him to get it right over the next couple of transfer windows, because if you look at their midfield, they have Pogba, Schneiderlin and Fellaini; that is £170m spent on central midfielders in the last three years and I still don't know which is the best pairing. Mourinho has got to try and build a pair or replace them."

Neville admitted United have made an uninspiring start under Mourinho's leadership, but the player-turned-pundit is "not alarmed" by their situation. He said the United side that capitulated 4-0 against Chelsea at Stamford Bridge on Sunday (23 October) is not one that reflects Mourinho's long-term aspirations at Old Trafford.

"There is a lot of work to do for United, but as a United fan I am not alarmed," he shared. "I thought that they would be better at the start of the season. Maybe that was a thought of Mourinho having a massive impact, but when you look at it [on Sunday], that's not a Jose Mourinho team at all.

"He has got to work with them, he's got to get more out of them. He can't do anything over the next three months and it will be difficult in January."