Xavi admitted that Tuesday night's 1-1 draw with Atletico Madrid at Camp Nou was not a good result for Barcelona in the context of their quarter-final tie.
Diego's barnstorming goal put the Rojiblancos ahead early in the second half, but Neymar curled home a perfect Andres Iniesta pass to deny the visitors victory.
However, despite Barcelona having to come from behind to salvage a draw, Xavi was unhappy with the scoreline, arguing that he and his team-mates had done enough to win the game.
"This isn't a good result," the 34-year-old midfielder told reporters after the game.
"We deserved more, but Diego scored a fantastic goal. Luckily we also scored, so the tie is still open."
The second leg will be held at the Vicente Calderon next Wednesday. Diego Costa is a doubt for the return leg after being forced off a third of the way into the tie with a hamstring injury, while Gerard Pique lasted only 15 minutes before succumbing to a pelvic problem.
"I hope Pique recovers as soon as possible," Marc Bartra, who came off the bench for the centre-back, told reporters. "It's not yet clear if he can play the return game. We hope he can."