The head coach has proved he is not afraid to make big decisions and will take off influential players such as Matheus Cunha in an effort to win a game.
He expects those players to be unhappy, but believes the respect his players have for each other has avoided any issues over his decisions.
"I don't know a player that likes to leave the pitch when they feel the team is playing," Pereira said.
"But sometimes it's important to think about the team.
"When I do the subs, believe me, I don't care about the names.