Read our guide to Sunday's big game at Wembley
A place in the Championship next season is at stake when Barnsley and Millwall go head-to-head in Sunday's Sky Bet League One Play-Off Final at Wembley.
The two sides finished fourth and sixth in the table respectively, with seven points between them, but that may count for little in this weekend's winner-takes-all clash, which would go to extra-time and possibly even penalties if level after 90 minutes.
What the managers say
Paul Heckingbottom: "It's about us being as good as we can possibly be and that's how we'll approach it. We're not going to change things drastically, we're comfortable in how we're going to do things and what is expected from the players. They understand that and that's why they're performing well.
"We know when we're playing Millwall that at some point they'll be putting us under severe pressure, but so what? They're going to have to do that if they want to beat us, but likewise we'll have to try and cope with that and impose ourselves on them."
Neil Harris: "We've got ourselves into a wonderful position and we are certainly in the Play-Off Final on merit. We deserve to be there and there's no doubt in the mentality of the group; we are going there to win.
"Naturally there is a lot at stake and subconsciously that is always in your mind, but the players have to focus on the game and not the occasion. That's the biggest thing.
"But we've had a real focus about us for a period of time now and that won't change this weekend. We will be ready. All preparation has been taken care of and now we're focused on the job in hand and how we affect the game."
Barnsley caretaker head coach Heckingbottom could name an unchanged starting Xl for the sixth game in a row.
Josh Scowen looks set to continue at full-back, while loanees Lloyd Isgrove, Josh Brownhill and Ashley Fletcher should also start before returning to their parent clubs.
Marley Watkins, James Bree and George Smith have all returned to training and could be included in the squad, though Ryan Williams remains absent.
Millwall will be without Mahlon Romeo, who serves the final match of a three-game suspension, so Carlos Edwards is likely to continue on the right-hand side of defence.
There are doubts over the fitness of Byron Webster, who limped off in the closing stages of the Semi-Final second leg against Bradford with a hamstring strain. Harris says the centre-half will be given "every chance" to prove his fitness.
Apart from long-term absentee Shaun Cummings The Lions have no other injury concerns.
Barnsley go into Sunday's Wembley showpiece on a run of three straight wins and unbeaten in five games - including their two impressive Semi-Final victories over Walsall.
Looking further back The Tykes have lost just once in their last 13 games, during which they've won eight times.
Millwall are unbeaten in six matches, of which five have been won - a run which stretches back to the middle of April.
The Lions' 2-1 defeat to Barnsley at Oakwell in early January was one of just four defeats from 25 League (and Play-Off) games since the turn of the year. Of those 25, Millwall have been victorious on 15 occasions.
Sunday's match marks the 51st meeting between Barnsley and Millwall in all competitions.
History matters little this weekend but it is The Tykes who hold the head-to-head advantage with 21 wins to 19 for The Lions, while the remaining 10 matches have ended all-square.
The South Yorkshire side have certainly enjoyed this fixture in recent times, winning four of the last five meetings, including the two League games earlier this campaign. Millwall's last victory over Barnsley was a 1-0 success in November 2013.
Information for Lions fans
Millwall supporters have been allocated a long list of pubs ahead of the game. Find out where they are by clicking here
Fans needing to collect their match tickets at Wembley, and indeed those who are yet to receive theirs by post, can read important information by clicking here
Those travelling by coach from The Den are advised that the Lions Store is open from 9-11am, with 30% off Wembley Wear available in store only.
Barnsley can be backed at 10/11 to be promoted on Sunday while Millwall are evens (1/1) with Sky Bet to succeed at Wembley.
Sam Winnall (4/1) and Ashley Fletcher (6/1) are Barnsley's two favourites to open the scoring, while Lee Gregory (9/2) and Steve Morison (5/1) are the two Millwall players with the shortest odds to do the same.
For those odds and many more, visit Sky Bet
The Lions PlayerHD team will, as ever, be bringing you full match commentary, which you can follow by clicking here.
Updates from Wembley will also be available throughout the day via @MillwallFC
, the club's official Twitter account.
Tweets by @MillwallFC