Watch - the tightest relegation decider in Europe?

Heidenheim have hit good form at the right time, only losing one of their past seven Bundesliga matches [Getty Images]

Heidenheim are 17th in the league as they prepare to host Mainz on Saturday.

In mid-March, following a defeat by Eintracht Frankfurt, they were 10 points adrift from the play-off position and looked certain to be playing in the second tier of German football after three seasons in the Bundesliga.

Heidenheim have since lost only one of their seven league matches, which include wins against Union Berlin, Cologne and, most importantly, St Pauli.

If St Pauli and Wolfsburg draw, a win would take Heidenheim into the relegation play-off. Otherwise, they will need to win and finish with a better goal difference than whoever comes out on top.

St. Pauli have only won one of their past 10 Bundesliga matches [Getty Images]

St Pauli go into the last game of the season on the back of some poor results and sitting bottom of the Bundesliga.

The Hamburg side have only won one of their past 10 league matches - a 1-0 victory at Hoffenheim.

Their biggest issue this season has been a lack of attacking threat - they have the fewest shots of any team in the league and have averaged less than a goal a game (28 in 33 matches).

St Pauli do have the benefit of playing in front of their home fans, where they have picked up 17 of their 26 points.

Anything less than a win on Saturday, though, will see them drop to Bundesliga 2.

What each team needs

• Wolfsburg are in the driving seat with a better goal difference than their relegation rivals. A win would all but secure the play-off position, unless Heidenheim win by four goals more than them.

• A draw against St Pauli and Wolfsburg would still make the relegation play-off position as long as Heidenheim draw or lose to Mainz.

• Heidenheim need to better the result of either St Pauli or Wolfsburg, with goal difference needed if Wolfsburg win.

• A draw between St Pauli and Wolfsburg would mean Heidenheim just need to win to make the play-offs.

• As for St Pauli, only a win will see them reach the relegation play-off position, and they must better the goal difference of Heidenheim if they also win.

Watch St. Pauli v Wolfsburg

• St. Pauli v Wolfsburg

Previous matches

• Borussia Dortmund 3-2 Eintracht Frankfurt
• RB Leipzig 3-1 Union Berlin
• St. Pauli 1-1 Cologne