Manchester United manager Jose Mourinho admits that he's finding it difficult to change the philosophy at the club having taken over from Louis van Gaal this summer.
The Dutchman spent two years at the club but was sacked at the end of last season despite winning the FA Cup.
And Mourinho says he is working hard with his players to change things at the club ahead of Sunday's Community Shield game against Leicester City.
"It's correct that my teams are different from Mr Van Gaal's," Mourinho is quoted as saying by Sky Sports.
"I want to make it clear that that does not mean I think my teams are better, or better ideas, or my principles are better. It's a difficult situation to change the dynamics.
"It would be easier for me to have 20 new players and start from zero.
"For two years they have had some principles that are not my principles. But the players, without losing their identity, always try to adapt to the manager. Some things in their brains are automatic, which is hard to change.
"But we are working hard."