Thomas Tuchel was left disappointed despite Chelsea winning 1-0 last night.
The Blues were matched ball for ball by Barnsley and Tuchel was not happy with his team’s effort.
Tuchel, who cut an animated figure on the touchline, said: “The changes [he made at half-time] made it a little easier to get into the opponent’s half and overcome the first press.
“We did it well at the start of the second half and played constantly in the opponents half. We scored the goal and I had the feeling that they increased the risk but we stepped down in the little decisions.
“Not enough courage and it was too deep for a long, long time. We clearly can play better, so yes I expected more but not in terms that I am frustrated.
“If you lack a rhythm and a bit of self-confidence and you have to show on this pitch, against an opponent that takes all the risk and plays the game of his life, that is not easy. We can do better but I don’t want to be too hard on the players.”