All you need to know about Friday night's game
On paper, The Lions look to have put themselves in the driving seat after battling back from an early Tony McMahon penalty to secure a 3-1 first leg win last Sunday with first-half goals from Lee Gregory, Steve Morison and Joe Martin.
Historically Bradford have an exceptional record of recovering from first leg defeats in the Play-Offs, having seen off both Blackpool and Burton Albion in recent years, the latter against whom they overhauled a two goal margin.
The Lions' camp this week has remained focused on not looking back at Sunday's victory, but concentrating on ensuring that at 'half-time' in this tie, Bradford are not offered a way back in.
With the prospect of a trip to Wembley and possible promotion to the Championship at stake for the aggregate winners of this Semi-Final, both teams still have it all to play for at The Den.
"Their performance in the second-half last week showed just how dangerous they can be when they put pressure on you in attack and we will need to be at our best to get any sort of positive result.
Phil Parkinson: "Opportunities to get to Wembley and win promotion come few and far between in your career. That is why we will give it absolutely everything.
Carlos Edwards looks set to continue at right-back after slotting in to fill the vacant gap left by Romeo's absence in the first leg. Should he wish to tinker with his starting line-up, boss Harris has other options for that position in Sid Nelson, Tony Craig and Jimmy Abdou.
Bradford City could welcome back three key players for the Semi-Final second leg tie.
Striker James Hanson was sidelined last Sunday with a calf injury, and although noises from the Bradford camp suggest that the towering frontman will not recover in time, The Bantams will do everything possible to have Hanson involved at some stage of proceedings.
Likewise fellow forward Billy Clarke Clarke may be back in contention 10 days after surgery on a fractured cheekbone, but wearing a mask for protection.
The last two meetings featuring The Lions and Bantams in SE16 have finished with honours even; in the League last October there was little to choose between the sides as they slugged it out for a 0-0 draw whilst an FA Cup meeting in January 2015 finished 3-3 with a late Ricardo Fuller leveller securing a 3-3 result for Millwall.
Tickets for collection
Lions supporters are advised to arrive at The Den as early as possible to help avoid queuing ahead of kick-off (7.45pm).
Tickets are available for collection on Friday from the main ticket office (windows 1-10). All enquiries, please go to window 11.
Tickets for Monday's charity match
If you haven't already purchased your ticket for Monday night's 'Know The Score' charity match between a Millwall XI and Charlton XI then why not get yours now? It's a fabulous opportunity to watch some of your former Lions heroes such as Gary Alexander, Mark Phillips, Marvin Elliott, Matty Lawrence and Jimmy Carter face a Charlton team including Derek Hales, Mike Flanagan, Steve Gritt, Mark Kinsella, Peter Garland and Paul Gorman - and all for a great cause.
Full details here.
Regular updates will also be available via @MillwallFC, the club's official Twitter account.