Millwall boss Neil Harris couldn't hide his frustration following The Lions' narrow 1-0 Sky Bet Championship defeat to Brentford at Griffin Park on Saturday afternoon.
Romaine Sawyers scored the only goal of the game in the 47th minute, but the visitors squandered a chance to equalise from the penalty spot late on.
Harris stated his displeasure at the way some decisions went in the London derby, but also bemoaned Millwall's lack of ruthlessness in the loss.
"I'm very disappointed - frustrated is probably the best word," he said. "Brentford had a lot of chances as well. It was a really entertaining game at times - quite open, especially when we went a goal down.
"I'm also disappointed with some key decisions, but I save most of my frustration for my players, because when you come away from home against a footballing side like Brentford, you want to keep a clean sheet. We should also be good enough, clinical and ruthless enough to score goals and we wasn't.
"Individually, there were some really strong performances, but it's hard to praise my players when you've just lost 1-0 in a London derby. It's a game we should've got something out of. The players will sit on the bus home disappointed because they threw away at least a point today, if not three."
In the absence of a number of key players, Shaun Hutchinson was handed the captaincy for the first time.
The manager told the reasons behind his choice.
"With Tony Craig on the bench and Steve Morison, Byron Webster and Shaun Williams missing, I had to find leadership via other avenues. Hutch is dominant and aggressive and his performances have been outstanding this season.
"He leads by example every day on the training ground and he is respected by the players. He is somebody that naturally falls into the category of captaincy."
Harris also confirmed after the game that Steve Morison missed the clash due to a stomach tear.
"He's had it for two weeks," he added. "He'll be out for the forseeable future."