Meanwhile, Watford have put together a good run of form and are looking to secure their fourth successive league victory.
Millwall's time in the FA Cup came to an end last weekend as they were comfortably beaten by Bristol City, exiting the competition in the fourth round.
With one eye on a busy schedule of league action, Millwall boss Gary Rowett made eight changes to his starting lineup that secured three points at Huddersfield Town in midweek, but Rowett accepted that his team selection gamble did not pay dividends and that "some players haven't taken their opportunity."
The Lions now turn their attention back to the Championship, where they find themselves in midtable, nine points clear of the relegation zone and 12 points behind the top six.
Millwall's last meeting with Watford was a 1-0 home victory in the FA Cup back in January 2017, although they failed to win any of the previous four league meetings against them.
The Lions have struggled at The Den all season, having won the fewest home matches in the division with the 2-0 victory against Luton Town in October their only league triumph so far this season.
With three of their next four league games to be played at home, claiming a victory on Tuesday could provide a massive boost for Rowett's men heading into February.
Watford secured their third successive league victory last Friday as they beat an out-of-form Stoke City side 2-1 away from home.
Watford have the best home record in the division with nine wins from 12 matches played at Vicarage Road, but they head to Millwall having won only three of their 12 Championship away games.
The Hornets have a good record against the Lions, having won seven of their last 10 league meetings against them, although their last league visit was during the 2014-15 campaign.
Securing another win on the road would see them move into second place, four points behind leaders Norwich City, who would have a game in hand.
Millwall Championship form: WDLDLW
Millwall form (all competitions): LWDLWL
Watford Championship form: LWLWWW
Watford form (all competitions): WLLWWW
Millwall boss Rowett is likely to revert to a similar side that played against Huddersfield on Wednesday.
Strikers Matt Smith and Jon Dadi Bodvarsson are likely to start in attack, while goalkeeper Bartosz Bialkowski, left-back Scott Malone, midfielder Ryan Woods and winger Jed Wallace are among the players considered for a recall.
Winger Connor Mahoney is the only injury concern for the Lions, who is likely to miss out despite his return to training.
Danish winger Philip Zinckernagel, who came off the bench against Stoke, is pushing for his first Championship start of the season.
Millwall possible starting lineup:
Bialkowski; Cooper, Hutchinson, Pearce; McNamara, Woods, Leonard, Malone; Wallace; Bodvarsson, Smith
Watford possible starting lineup:
Bachmann; Femenia, Troost-Ekong, Sierralta, Masina; Zinckernagel, Hughes, Chalobah, Sarr; Pedro, Deeney
We say: Millwall 0-2 Watford
Even though Millwall are set to recall a number of first-team regulars to their side, the Hornets are in fine form at the moment and should have enough quality to claim three points on Tuesday against a team with a poor home record.
body check tags ::