"As a defender, you're always worried when you concede a goal," Ivanovic said.
"It's always important to not concede a goal and to keep a clean sheet. This, game by game, gives confidence for defenders and gives the stability for the team.
"For us as a defence line we will do everything to not concede a goal and try to do our best.
"In some goals we lost concentration. We conceded a couple of goals from set-pieces as well which is not usual for us.
"We know how strong we are in that part and we just have to get back to normal.
"We change a lot of small things for every game depending on the opponent. All these things have to work perfectly to not concede a goal."
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