Casillas was hit in the head by a water bottle, that a fan threw at him, during the Copa del Rey semi-final first leg.
“It is a good result. We scored a goal and did not concede any,” Casillas told the club’s official website. “We marked our opposition well as Sevilla created problems for us.
“We had to be very careful against Sevilla because it is a good team with a lot of great offensive players.
“The important thing for us is winning. We will now have to turn our attention to the league and taking on Osasuna, and then think about the second leg of the tie.
“A person had allegedly thrown a water bottle. It is a shame that the fans have been wonderful helping their team, and then someone does this which causes problems for others.
“If the cameras have caught the incident, I hope that action is taken.”
