Los Blancos were knocked out by Italian side Roma at the last sixteen stage and the coach insists that the Blaugrana have had lucky draws in Europe's elite club competition.
"Celtic is not Roma, we have not had the luck right from the start," Schuster told Sport ES.
"We haven't had the luck on the pitch as well as with injuries and thus we were not really able to have an impact in the Champions League."
The German however did not want to go into further discussion, afraid that he would be criticised for moaning about the situation.
"If I speak then everyone will begin saying that the German is crying and making excuses.
"The club knows very well the situation before hand as well as now, there have been moments which have affected us but people have not seen them clearly."
Schuster also spoke about the rumours which suggested he would get the chop for being eliminated from the Champions League.
"I don't think that someone's future can be decided by losing a certain game during the season, I think this would be ridiculous.
"It's necessary to pay more attention to the team and to the situation we are in, if we look at other teams, history will tell you that they begin to win major honours in the second or third year.
"It's about putting in the hard work and creating a competitive team and then the trophies will arrive," concluded the Merengues coach.
