Roberto told BBC Sport “It was the most one-sided 0-0 you will see in the Championship.
“The performance in many, many areas was outstanding.
“The points will come if we keep playing like this. I am taking a lot of positives out of this performance.
“I don’t think the player (Rowlands) is a malicious player. When the ball is there, you are allowed to challenge for the ball.
“But when you hit a goalkeeper on the face, it’s avoidable.”