'Impossible' Louis Van Gaal makes his players want to KILL him, City chief warns United #CarryGobySeanKellz #FutureGroupNG via @myentertain9jar

MANCHESTER UNITED have been warned by rivals City that Louis van Gaal has a 'difficult' style of management that could alienate players.

Louis van Gaal has been described as a 'difficult' character to work with[GETTY]

City chief Ferran Soriano - who worked with van Gaal at Barcelona - admitted that the Dutchman knew how to win but that it would come at a price.

Van Gaal is renowned as a controversial character but has won league titles in Spain, Germany and Holland.

And Soriano revealed that the 62-year-old's style could destroy morale among the Old Trafford squad.

Manchester City chairman Khaldoon Al Mubarak (right) and Chief Executive Ferran Soriano (left) [GETTY]

Louis van Gaal has been a very good coach in many clubs but his style is very difficult

City chief Ferran Soriano

"If you treat your people badly, they remember," Soriano said. "One day you make an error and they kill you. I've seen this in many clubs.

"Louis van Gaal has been a very good coach in many clubs but his style is very difficult. The same thing happened to him in Barcelona as in Bayern Munich.

"He is very tough, people don't like him, but he wins. And one day you don't win - and when you don't win, everybody that is angry with you will come back to you and try to kill you.

Van Gaal is poised to take the United job in the next week [EMPICS]

"In the movies this works, in real life it doesn't."

Soriano's comments were made at a conference in March, but have only just come to light, a week before van Gaal is set to be appointed at United.

Express Sport understands the former Bayern Munich boss will be confirmed as United's new boss after their final home game of the season against Hull next Tuesday.