All you need to know about Saturday's League One clash
Having started the season without gaining a point in SE16 in their first four matches, The Lions have tasted success five times since then with only Bradford City smuggling a point away from The Den courtesy a 0-0 draw on 31st October.
Gillingham's strength this season has largely been down to their home form, chalking up eight wins and just one loss at Priestfield. However, Justin Edinburgh's side have not managed to reproduce that level of performance consistently on the road and four of their five defeats since August have come away from home.
"Everyone is chasing us now, everyone wants to beat us and people want to get to where we have been at all season. With Millwall we have got another team chasing us, with a bigger playing budget, bigger finances and gates but we will go there with the belief we can perform and get something from the game."
The postponement of last weekend's game at Oldham Athletic, whilst frustrating, handed striker Steve Morison extra time to recover after he left the field in the Southend United JPT tie as a precautionary measure. Winger Fred Onyedinma will also be assessed ahead of the weekend's match.
Midfielder Jimmy Abdou got a full 90 minutes of match action under his belt playing for the U21s in Monday's 1-0 win at Watford, and is set to be included in the squad, along with frontman Alfie Pavey, who also featured against the Hornets and has been on the bench regularly for the first team since mid-October.
The 26-year-old was virtually ever present for Gillingham until his sending off in the 2-1 win over Scunthorpe on 20th October, since when he has only made two League starts. But with Doug Loft serving a suspension following his dismissal against Burton last weekend, Justin Edinburgh may turn to Wright as his holding player in midfield.
The good news for the Gillingham boss is the return to fitness of striker Luke Norris, who has been sidelined with an ankle injury picked up in the win at Crewe in October. The front man, who has scored three times to date this season, looks set for a place on the bench.
Gillingham have tasted victory on 26 occasions - most recently at Priestfield in September 2009 - with the remaining 21 games finishing all-square.
It was 10th April 2010 when these teams last locked horns and promotion-chasing Millwall looked every inch the part of a club in the ascendancy as they romped to a 4-0 win at The Den.
Scorers: Batt (27mins), Craig (35mins), Schofield (60mins), Harris (66mins)