Krul was the hero as he saved two penalties in Saturday's dramatic shootout victory over Costa Rica.
However, the 26-year-old's methods have since come under scrutiny after the shot-stopper appeared to indulge in gamesmanship by delaying Costa Rica's penalties and speaking to the players.
"I don't think I have done anything wrong," he told reporters.
"I haven't shouted at [them] in an aggressive manner. I haven't done anything crazy. I just told them I knew where they are going.
"I am trying obviously to get into their heads and it worked. I use everything in my power to make it happen."
Louis van Gaal's side will now face Argentina in the last-four stage of the tournament on Wednesday.