Chelsea lost 2-1 to Southampton last night at the St Mary’s.
The Blues lost their midweek fixture to Southampton and Tuchel has blasted the team’s defending and mentality in the game.
Tuchel’s men have taken only seven points from their first five games in the top-flight and are just a point above Manchester United.
“We are not tough enough to win these matches away,” Tuchel said in his post-match press conference.
“Today, we scored so everything was okay but one set piece again, one sloppy defending again, we were off-balance and we did not react to it. We were lucky not to concede a third goal at the beginning of the second half. We were not tough enough as a team to react or push it over the line for us.
“Soft defending. What stops that is pure mentality, stop it with defending mentality. There is no superiority for the opponent, there is no need to give shots away, just toughen up as a team and show a different mentality.
“I don’t like to talk about it normally because you cannot prove it with data or tactical position but it is like this,” Tuchel added.
“Both goals are cheap, soft goals and should not happen if you expect to win a match in the evening at an away stadium.”