Valencia midfielder Daniel Wass admits defeat to Real Betis wasn't good enough.
Valencia were ripped apart by Betis 4-1 in midweek.
Wass later said: "It was a bad game for everybody and we lacked a lot to win that game.
"When you concede four goals you can't win a game. It makes things more difficult. The good thing is that we have more games coming up. We have to change our mentality, above all. We lacked a lot of intensity and other aspects of our play. We are going to change everything in order to win on Saturday.
"Above all, we're going to get stronger in defence. Not only the back four, but every player. We're conceding a lot of goals, and we can't let that happen. It makes everything more difficult," acknowledged the midfielder.
"We've gone seven games without a win now, and that can't happen. We have an eighth game on Saturday and we're going to win.
"I apologise, because we can't have a game like that. It's seven games without winning as well. On Saturday we have another game at home in front of our fans, and we are going to change our mentality and, above all, the showing that we give."
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