Bremen - Borussia Dortmund round out the year in six-pointer territory with a trip to bottom-of-the-table SV Werder Bremen on Saturday afternoon (kick-off 14:30 GMT/ 15:30 CET).

bundesliga.com previews a must-win clash for two sides that have spent the last month or so floundering in and out of the relegation places...

It's almost inconceivable to think that UEFA Champions League combatants Dortmund could be about to spend the festive period in the drop zone. A win should spare them the ignominy, but victory for Bremen - as well as lifting the Green-Whites off the bottom - would leave BVB scrambling in the automatic relegation places.

(r.) is expected to partner Alex Galvez at the heart of the back four following Luca Caldirola's sending off against Borussia Mönchengladbach and resultant one-match ban. Sebastian Prödl and Franco Di Santo remain sidelined through injury.

Jürgen Klopp will likewise have to shuffle his back line after Neven Subotic picked up his fifth yellow card of the campaign in Wednesday's 2-2 draw with VfL Wolfsburg. (l.) is the obvious replacement at centre-half and could be joined in the starting XI by fit-again Polish midfielder Jakub Blaszczykowski.

The performances of have been one of precious few constants for the Weser dwellers in 2014/15. The Austrian international midfielder was on target for the second time in as many games in midweek and certainly won't be afraid to test the mettle of BVB goalkeeper Mitch Langerak from range.

If the travelling supporters are to return home with something to cheer, you can bet your bottom dollar will have something to do with it. The Gabon international is arguably in the form of his life and, whether it's out wide or as the lone striker, he's bound to cause the Bundesliga's leakiest defence problems.

Victor Skripnik, Bremen head coach: "[Dortmund] are like a beat-up boxer, but even they can hit back."

, BVB left-back: "We can take a lot from the [Wolfsburg] game. We need to repeat that in Bremen."

Bremen failed to keep a clean sheet for the 13th time this season in Wednesday's 4-1 defeat to Gladbach. Dortmund avoided a tenth league loss by taking a point off Wolfsburg, but head to the Weser Stadion as the Bundesliga's worst-performing away team in 2014/15 (W1, D1, L6).

Dortmund have won their last six games against Die Grün-Weißen, plundering five goals on each of their last two outings on Bremen soil. Werder haven't beaten BVB since May 2011, while only two of the clubs' last 20 Bundesliga match-ups have ended all square.

Possible line-ups:

Bremen: Wolf - Gebre Selassie, Galvez, Lukimya, Garcia - F. Kroos - Fritz, Junuzovic - Aycicek - Bartels, Selke

Dortmund: Langerak - Piszczek, Ginter, Hummels, Schmelzer - Kehl - Blaszczykowski, Gündogan, S. Bender, Großkreutz - Aubameyang

Click here to find your local broadcaster for this match.

Check out Bremen midfielder Zlatko Junuzovic's stunning free kick against Gladbach courtesy of the official Bundesliga YouTube channel: