STEVE Lomas admitted Millwall "only had themselves to blame" for losing their opening game of the Championship season to Yeovil.
Ed Upson's 88th-minute winner stunned the new Lions boss as his first competitive match in charge ended in a disappointing defeat to the newly-promoted Glovers.
Lomas said: "It was very hard to take but we only have ourselves to blame. We had five decent chances and you've got to take them. Their goalkeeper made two very good saves, but with the standard of chances we created, we've got to take one.
"From our point of view, a shot from the edge of the area unopposed is not good enough.
"Once you don't take your chances, you're open to the sucker punch. There was one Andy Keogh slashed, where if he leaves it Steve Morison tucks in.
"Marek Stech made a good save from James Henry when he was through with probably the only bit of passing and movement in the first half."
Lomas was critical of his side's use of possession, particularly in the opening 45 minutes, but felt substitute Nicky Bailey made a positive impact on his debut.
"When Nicky came on he looked lively and wanted to get on the ball," Lomas said. "He hit an excellent through ball for Morison that led to Henry's chance, where he maybe could have slid it in but just lifted it over.
"We finally got the full backs joining in because we got our passing going in midfield, whereas first half we were winning the ball and giving it away. We didn't keep the ball well enough.
"There's a long way to go, we'll get better and we'll get the players that have come in late fitter. The lads were competitive but we were missing a bit of know-how at times.
"People need to get on the ball when the going gets tough. Anybody can smash into tackles but showing what you can do in the heat of battle shows real character. Are you going to be the one that wants to get on it?
"Whether we were so keen to do well in the first half that we forgot about the process [of scoring goals], I don't know."