However, the Italian has insisted that the result will not influence Wednesday's Copa del Rey final between the two sides at the Mestalla.
"It was a surprise because Barcelona has more quality than Granada, but at this time of the season all teams are fighting for a goal and those fighting for salvation are the most dangerous," he told reporters at a press conference.
"I think Barcelona are thinking they can still win the league. There are many surprises in this league, and I think they will fight to the end. It will not change the dynamic of Wednesday's match."
Madrid are currently second in La Liga, one point ahead of third-place Barcelona and three behind leaders Atletico Madrid.