Gary Rowett's Millwall have struggled to hit the heights so far this season, having only won six games this campaign.
Next up for the Lions is high flyers, Watford who currently sit comfortably in third place.
The Hornets come into the fixture having won their last three league games, most recently beating Stoke City 2-1 on January 22.
• Team news
Midfielder, Billy Mitchell is Millwall's only confirmed absentee as he is still recovering from an injury.
After a thumping in the FA Cup on the weekend, Rowett could revert back to his usual 3-4-3 formation, with the likes of Jed Wallace, Ryan Woods and Scott Malone likely to return to the starting XI.
Watford are currently riddled with injuries with Christian Kabasele, Domingos Quina, Isaac Success, Ben Foster, Stipe Perica and Tom Dele-Bashiru all set to miss this fixture.
• Predicted lineups
Bialkowski; Pearce, Hutchinson, Cooper; Malone, Leonard, Woods, McNamara; Bodvarsson, Bradshaw, Wallace
Bachmann; Femenia, Sierralta, Troost-Ekong, Masina; Zinckernagel, Chalobah, Cleverley, Sarr; Deeny, Pedro
Millwall are likely to utilise their usual 3-4-3 formation with Watford presumably going to play in their regular 4-4-2 style.
• Ones to watch
Millwall - Jake Cooper
Lions defender, Jake Cooper, has been key to Rowett's defensive unit this season.
Whilst Millwall's results so far this season haven't been brilliant, they have been pretty solid defensively. Cooper has helped his side to nine clean sheets so far this season along with having one goal and one assist to his name.
Cooper poses a threat in both boxes and his ability in being able to read the game gives him an advantage over opposition attackers.
He has had an average rating of 7/10 so far this season and has been one of Rowett's most consistent performers. If he is on his game he could be key to Millwall getting something from this game.
Watford - Troy Deeney
Watford frontman, Troy Deeney, spent the start of the season on the sidelines due to a knee injury but has since found some fine form.
The 32-year-old has six goals in just 11 starts so far this season, as well as three assists. His experience and presence are of a top-level and his leadership skills help drive his team on when he is on the pitch.
His minutes per goal ratio is the best in the Watford squad so far this season, averaging a goal every 164 minutes.
Since he has been involved for Watford, his attacking quality has been a huge boost and his eye for goal has helped edge Watford to some important wins this campaign.
• Previous meetings
The last time these two sides met was back in 2017 in an FA Cup clash which saw Millwall come away as 1-0 victors - Steve Morrison with the goal.
Their last two Championship meetings have been won by Watford and the last time Millwall beat Watford in a league clash was right back in April 2013.
Last time out:
• Where to watch
This game kicks off at 19:00 BTS on Tuesday 26 January 2021.
The game is also live on Sky Sports Football.