Valdes has now gone 466 minutes in Europe without being beaten, beating the club record of 406 minutes set by Pere Valenti Mora over 30 years ago.
"I went a long time in the 2005-06 campaign without conceding but I don't want to make too much fuss about this.
"It will remain just a statistic until we qualify from the group and, hopefully, win back the Champions League."
He added: "I think that when you go a long time without conceding it is your concentration which counts, and I always think that I will be put under pressure at any second and I am always alert.
"It's a pleasure playing in this team and you have to be careful not to be distracted just watching the superb play of our midfielders and strikers."