FC Barcelona coach Rijkaard admitted in the official post match press conference that Real Zaragoza was the better team on this evening and deserved to win. He felt that it was not Barca´s night and the team did not play on the level they wanted.
Here are Rijkaard´s ´s Post-Match Comments during the press conference:

It was not our night. The result was justified. Zaragoza played more aggressively than us and they have shown that they were more focussed on winning the game. My players continued battling, but did not always play at the level we wanted. We were just not able to it.

Milito's winning goal did us a lot of harm. But we tried to find an equaliser, but could not. I do not think it was a question of mentality because the team worked hard.

During the first half we did not play well with the 3-4-3. When we changed to 4-3-3 after the break we did not have the capacity to change things once they had taken the lead. La Romareda is always a difficult place for us. Throughout the second half we tried everything.

It is easier to say that the coach is to blame as he is a single person.