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The Special One shelled out more than £150m in the summer for Victor Lindelof, Romelu Lukaku and Nemanja Matic.

And they have helped Manchester United to second in the table, five points behind rivals Manchester City.

But despite the improvement on last season, Mourinho has been criticised for his style of play.

Allardyce thinks those that are not approving of the way United were setup against Liverpool are wrong though.

“Everybody plays more open attractive football if you’ve got the players, if you’ve gone and spent and bought those players,” he told beIN Sports.

“Finding those players is harder than ever before, there’s fewer of them and they’re hundreds of millions of pounds now.

“It’s a very difficult task now to build a Manchester United team that Sir Alex Ferguson had for instance.

“That would cost you probably in the region of six or £700m in today’s market.”

United return to action tomorrow evening in the Champions League when they welcome Benfica to Old Trafford.

Following that, Mourinho takes his side to Chelsea on Sunday in the top flight.