Daniel Farke felt his Norwich City side lacked control in their FA Cup defeat to Barnsley on Saturday.
A much-changed Canaries sides, featuring many players coming back from injury, found it difficult against the Tykes at Oakwell, with Callum Styles' 56th minutes strike the difference between the two sides.
"Barnsley away is a difficult game anyway and in these circumstances and time of year, the pitch was horrendous - all details have to be perfect to go for this game," said the City boss.
"Barnsley were highly motivated, they played their strongest starting eleven. We had to find a good balance between rotating a little bit and resting a few players and give some players who desperately need gametime some minutes.
"My feeling was, we found a good mix but it's then important to be good in the details. We were not good enough to control this game much in the first-half.
"Barnsley pressed us quite well and but as the game went on we took more and more control over the game, without being that dominant to create more chances.
"Then you have to be good in the details and I got the feeling, of course, we could have defended the situation when they went in the lead much better.
"It's then difficult to turn this game. We had two great chances late on when we went for it but it was a difficult game for us and we have to accept the loss."
There was an injury concern for the City boss with Jordan Hugill forced off with what appeared to be a hamstring injury.
"It's a hamstring issue, he felt it during a sprint. We then had to play with our young striker without three strikers in the squad.
"I hope to have Teemu Pukki and Adam Idah back pretty soon, maybe to be involved in the next game.
"But I'm pretty sure Jordan will miss a few games. It's tough for a young guy [Omotoye] to play up front on his own as you try and change the game.
"No complaints about this. It wasn't easy for him. I don't want to criticise my team too much today."