The Lions have scored just nine times from open play since the turn of the year and have currently not scored for 338 minutes.
Following their latest shut out - a 0-0 draw with Blackburn Rovers in the FA Cup yesterday afternoon - Jackett has insisted that his attacking players need to "improve" their goalscoring return.
"Goalscoring has been a problem for us throughout this year," Jackett is quoted as saying by the London Evening Standard. "We had an outstanding 2012 in terms of goals but yesterday showed that when we create pressure, we need to score. It is frustrating because there was a win there for us.
"Either it did not quite fall for us or we could not quite get the finish. Goalscoring is such an important part of the game. It is key and something we need to improve."
Millwall's leading goalscorer is still Chris Wood, who left the club for Leicester City in January.