Reports in Spain had suggested some members of Real's squad had been put out by the huge media hype that has followed news of Beckham's transfer to El Santiago Bernabeu, but the Spanish international custodian believes the England skipper will add further quality to Real's ranks which all players will welcome.
"He is a player of great quality and he will strengthen the squad. That is undeniable," said Casillas.
"It's better to have Beckham on your side than not.
"He is one of the best in the world and he could help us mould better and win more titles.
"His signing caused a great stir, but we are concentrating on the fact that he is a football player."
Asked whether he thought Beckham's status as a media icon would affect his performance, or destabilise the team, Casillas remained unequivocal.
"I believe that will not affect neither him nor us.
"Some players sell more than others, and Beckham is one of the most successful in that market.
"But he is a good player and professional and he has shown that on the pitch.
"He knows how to differentiate between publicity and training and playing.
"From this point of view I don't think there will be problems."
Casillas also revealed that he had been shocked by Real's decision to dispense with the services of Vicente del Bosque after the coach's highly successful four-year tenure at the club.
"The club does what it believes best and you have to accept and respect that.
"I was expecting him to continue because in the four years he had here he achieved important things.
"It seems strange that they should get rid of a manager who has just won the league, but the club has to look to do what is best."
