Barcelona coach Pep Guardiola admits his players looked jaded in defeat to Real Madrid.
As was the case in the defeat to Chelsea, Barcelona failed to take a number of opportunities which came their way.
"I have seen the players' impotence," he admitted.
"We have opened up the field, we had opportunities...I think we had more chances than in other matches against Madrid. (But) these guys have four years of playing every competition possible and sometimes lack a little freshness. That can happen, especially bearing in mind the opposition.
"The effectiveness (in front of goal) has made the difference in these two games (against Real and Chelsea). But that's part of the game," Guardiola added.
Guardiola felt Barca were more than a match for Real, adding: "I do not think we've been inferior to Madrid. Except the two goals, (Barcelona goalkeeper Victor) Valdes has had little work. We have taken the game to where we wanted. Now we are sad but from tomorrow we will recover to face the Chelsea game."