Barca have suffered consecutive El Clasico defeats, along with a loss to AC Milan in the Champions League in the past fortnight.
"We weren't looking for the draw," said Zubi.
"In a competition you sometimes win and sometimes your competitors do.
"The Liga is very long and we'll try to overcome these circumstances.
"We're a Club that is used to difficult moments, but we never give up. We always compete, that's our history."