Daniel Farke says the manner of Norwich City's 3-1 defeat at Cardiff City was 'tough to accept'.
The Canaries controlled for much of the opening period, and deservedly took a 1-0 lead into the break courtesy of Marco Stiepermann's first for the club.
However, they were pegged back almost immediately after the restart from the penalty-spot; a position from which the home side capitalised.
"We were against a team who had won their last three games. They didn't give one chance away and went into the lead with a brilliant goal.
"What happened in the second half, for me, was unacceptable. All of the decisions were against us in the second half.
"It makes it almost impossible to win the game but we have to accept it."
After seeing his team perform well for a substantial amount of the game, Farke was reluctant to be too critical.
"We made one mistake, a poor loss of the ball for the third goal," he added.
"I can't avoid criticising that but it's the only situation I can criticise in this game. We were so close to turning the momentum around to our side.
"To accept that we have a loss out of this situation is unbelievably hard. It's totally disappointing."