At a time when Rovers have put together a five-match unbeaten streak, the visitors have recorded five successive draws, resulting in them dropping down to 11th position.
Like last season, some of Blackburn's results have gone under the radar, but they have now reemerged as one of the dark horses for a playoff spot come the end of the season.
As well as retaining their record for the most goals in the division, Tony Mowbray's side have collected 11 points from their last five matches in the second tier.
Their latest success came on Saturday as they edged out Barnsley by a 2-1 scoreline in a game which saw Adam Armstrong net his 13th goal of the campaign.
Rovers have now started to add defensive performances to their game with just three goals being conceded in their last half a dozen outings.
Maintaining that ratio at the back is just as important as Armstrong continuing with his scoring streak, although the latter may prove more difficult against one of the strongest defensive teams in the league.
Gary Rowett is coming in for a bit of criticism after five draws in a row, a run which has led to the Lions moving down from the playoffs and into mid-table.
Nevertheless, with three shutouts coming from five matches, the foundations are there for Millwall to hang around the top 10 in the long term.
Rowett's problems are in attack with no-one other than Jed Wallace scoring more than one goal in the Championship this season, a record which must change sooner rather than later.
Despite possessing the third-best defensive record in the division, Rowett knows that it will count for little unless the Lions begin turning draws into victories.
Blackburn Rovers Championship form: LDWDWW
Millwall Championship form: LDDDDD
Blackburn will be forced into at least one alteration after Barry Douglas picked up an injury at the weekend.
Blackburn Rovers possible starting lineup:
Kaminski; Nyambe, Wharton, Lenihan, Bell; Holtby, Trybull, Johnson; Gallagher, Armstrong, Brereton
Millwall possible starting lineup:
Bialkowski; Hutchinson, Pearce, Cooper; Leonard, Woods, Thompson, M.Wallace; J.Wallace, Smith, Bradshaw
We say: Blackburn Rovers 2-1 Millwall
Despite facing opponents who have won just four times this season, Rovers will not get complacent against a strong defensive unit. The goals may not flow like they have previously in the season, but we expect the home side to edge a tight game by the odd goal in three.