Barcelona coach Xavi concedes their draw with Europa League opponents Galatasaray "wasn't good".
Gala left Spain with a 0-0 draw from the first-leg of their round 16 tie.
Xavi said, "Given that we were playing at home, this isn't a good result. In the second half we were a little bit better, but when you drop intensity things get a bit more even between the teams.
"But I told you yesterday. This is the Europa League and the rivals are here by their merits. It's a tough, quality competition and we need to be humble in our work. Right now it's all square – we've not lost everything thanks to this result, nor have we put ourselves in a winning position.
"We go to Istanbul needing to win to go through – just like when we went to Naples."