O'Reilly stated that the intensity of the tournament leaves no room for complacency against a dangerous Norwegian side.
"We've got another tough game coming and obviously there's still a few more games to be played for the top eight places, but every team's going to be tough, and we need to be ready," he said.
The young midfielder described the atmosphere at the Azteca Stadium as the most intense environment of his playing career.
"The Mexico match was the craziest game I've ever played in," O'Reilly stated.
O'Reilly credited the squad's resilience for helping them overcome the hostile atmosphere and advance further in the competition.
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"At the Azteca the fans were crazy, but we got through it and now we're in the quarter finals," he added.
