"The club (Palace) made a decision to get Frank as manager because of his way of working and how he wanted to play, but as a manager to go to England to work and get success straight away is not easy, I know that," Stam said in an interview with Sky Sports.
"Sometimes, though, as a manager you need to have time as well to build something, to create a certain atmosphere within the group and a certain belief to do well and get results.
"The only thing is - are we patient enough? Do you get the time? And that is not always the case."
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