While the Bavarians have already been dethroned at the summit of German football by new champions Bayer Leverkusen, the Iron Ones still have work to do to guarantee their survival in the top flight.
Match preview
Bayern Munich remain on course to salvage something positive from a below-par 2023-24 campaign after they defeated Arsenal 3-2 on aggregate to advance from the Champions League quarter-finals following three successive years of failure at this stage of the competition.
After drawing the first leg 2-2 in London last week, Joshua Kimmich's second-half headed sealed a slender 1-0 home victory in the reverse fixture on Wednesday to set up a last-four showdown with Real Madrid - who beat holders Manchester City on penalties - later this month.
Victory over Arsenal provided Thomas Tuchel's side with a much-needed boost just three days after they conceded the Bundesliga title to high-flying Leverkusen. The Bavarians' hopes of avoiding their first trophyless season since 2010-11 remain alive thanks to their Champions League endeavours.
Before locking horns with Real Madrid, Bayern must prepare for two Bundesliga fixtures against Union Berlin and Eintracht Frankfurt, and although the title race is over, Tuchel's side will be keen to consolidate second spot and better last season's points total of 71, with three victories from their remaining five games required to achieve that.
Bayern enter Saturday's contest having won only one of their last five Bundesliga away games, while only Hoffenheim (19) have conceded more away goals than the Bavarians (15) in 2024. However, Bayern have never lost in nine previous Bundesliga meetings with Union Berlin, winning six of those including a narrow 1-0 success in the reverse fixture in January.
Union Berlin extended their unwanted winless run without scoring to three matches last weekend when they suffered a 2-0 defeat away against European-chasing Augsburg.
Goals either side of half time from Phillip Tietz and Sven Michel condemned the Iron Ones to their 16th loss of the campaign - twice as many as last season when they finished fourth - and leaves them in danger of the drop heading down the home straight.
Nenad Bjelica's side remain 13th in the Bundesliga standings with five games left to play, but they now sit only three points above the relegation playoff position after 16th-placed Mainz 05 beat Hoffenheim 4-1 last weekend.
Union Berlin will welcome a return to Stadion An der Alten Forsterei where they have accumulated 20 of their 29 Bundesliga points this season, although they have only won one of their last seven league games in front of their own fans - a 2-1 victory over Werder Bremen last month.
The Irons Ones held Bayern to a 1-1 draw the last time they played host in September 2022, but that was sandwiched between three away defeats without reply, including the aforementioned 1-0 loss earlier this year during which Bjelica was sent off before being hit with a three-match ban and a £21,000 fine after pushing Leroy Sane in the face following a heated altercation on the touchline.
Union Berlin Bundesliga form:
L
L
W
D
L
L
Bayern Munich Bundesliga form:
D
W
W
L
L
W
Bayern Munich form (all competitions):
W
L
L
D
W
W
Team News
Union Berlin goalkeeper Jakob Busk remain sidelined with a calf injury, while Yorbe Vertessen (muscle), Jerome Roussillon (calf), Josip Juranovic (knock) and Rani Khedira (thigh) will all be assessed ahead of kickoff.
Left wing-back Robin Gosens - Union Berlin's top scorer this season with six goals - and midfielder Lucas Tousart are both available to return from suspension and are expected to be recalled to the starting lineup, with Alex Kral and Benedict Hollerbach the most likely duo to make way as a result.
Kevin Volland, who has not scored since mid-December, will be hoping to force his way back into the first XI having recently made three substitute outings, but Bjelica may prefer to stick with Brendan Aaronson and Mikkel Kaufmann in attack.
As for Bayern Munich, Kingsley Coman (groin) Sacha Boey (hip), Tarek Buchmann (hamstring), Gabriel Marusic and Bouna Sarr (both ACL) all remain sidelined with injuries.
Serge Gnabry missed the midweek Champions League win due to a thigh problem, but the winger could be in a position to return to the matchday squad on Saturday if he passes a late fitness test.
With little to play for in the Bundesliga, Tuchel may look to freshen up his starting lineup, with Dayot Upamecano, Kim Min-jae, Aleksandar Pavlovic, Thomas Muller and Mathys Tel among those hoping to force their way into the first XI.
Union Berlin possible starting lineup:
Ronnow; Doekhi, Vogt, Leite; Khedira; Trimmel, Tousart, Schafer, Gosens; Aaronson, Kaufmann
Bayern Munich possible starting lineup:
Neuer; Kimmich, De Ligt, Dier, Davies; Pavlovic, Goretzka; Muller, Musiala, Tel; Kane
We say: Union Berlin 1-3 Bayern Munich
While the pressure is on Union Berlin to pick up precious points in a bid to avoid the drop, Bayern are merely playing for pride, but Tuchel's men remain firm favourites to come out on top this weekend.