Thomas Tuchel has warned his strikers that they are on trial.
Chelsea forwards have missed a host of opportunity and Tuchel’s patience is running thin.
Tuchel, whose side lead 1-0 from the away leg, said: “We create enough chances and half-chances to win games.
“If you arrive at elite football at the highest level then there is no time to perform. The time simply doesn’t exist.
“You are simply in a competition with other players in your team.
“There is no time to get four or five matches in a row to score regularly. That simply does not exist.”
Tuchel said: “Then it is clearly my fault and I take responsibility for changing.
“At the same time, if we put the goalkeeper in goal, we expect him to perform in that match.
“If we put the defensive line-up, then we expect the line-up to have a clean sheet and not just one in every three matches.
“We try to put them in a good mindset.
“We are pushing them and they’re working hard against the ball with the whole team, so this is also a point.
“We did some changes because we needed to adapt.
“The results are not crazily bad. We need to be more precise and focus better on our decision-making, the technique, how to finish — and these are the points that we work on.
“Our strikers are very aware of that and they have the highest demands of themselves. We are not pointing fingers to make this clear.”