Lee Clark was frustrated with the way Huddersfield conceded goals in the 2-1 defeat at Plymouth.
Ant the Town boss felt the absence of Damien Johnson - on loan from Argyle and ineligible to play - was a factor in the loss.
Bradley Wright-Phillips netted for the hosts either side of Anthony Pilkington`s equaliser.
"I am certainly not happy with the two goals that we have given away," said Clark. "They were very simple: goalkeeper to Rory Fallon, headed on, and then the third touch is in the back of the net.
"Both goals were like that and it was very poor. We could have defended better for both goals."
On Johnson, Clark added: "Damien Johnson has been outstanding for us and we have lost a game where he doesn't play. His consistency has been of the highest quality, so it's easy for people to see now that we have missed him."