KENNY Jackett says Millwall need to improve in "both boxes" after Brighton inflicted a third-straight defeat on the Lions.
Chris Wood's 79th-minute strike proved to be a mere consolation as goals from Ashley Barnes and Adam El-Abd secured victory for the Seagulls.
Wood nearly grabbed a dramatic equaliser in second-half stoppage time, controlling Alan Dunne's cross and blasting a shot goalwards, but goalkeeper Tomasz Kuszczak made a crucial save to preserve the visitors' lead.
"I was disappointed with the goals against us," he said. "Between the boxes we've improved as a side, but we're not getting it right in either box. The second goal in particular gave ourselves a mountain to climb.
"Ultimately, we nearly did it with Wood's late chance and a lot of pressure. We nearly got it back. But against good sides we can't be conceding this many goals.
"After we conceded the second goal we wobbled a bit until Paul Robinson came on and then I felt that with eleven men, and then ten, he showed good leadership and steadied the ship slightly."
Substitute Chris Taylor was sent-off in the 67th minute for going in late on Kuszczak – but Jackett said the winger was disappointed with referee Andre Marriner's decision.
"My impression is that it was harsh," he said. "The referee said he caught him.
"Chris felt the ball was there to be won and that if there was any contact it was minimal and that it didn't warrant a sending off.
"My player didn't go through the guy. I haven't seen it yet on the tape."