Borussia Dortmund coach Jurgen Klopp knows Sunday could be a key day in determining the destination of the Bundesliga title this season.
They will know before taking to the field whether they have a two, a three or a five-point cushion over their only rivals for the title, with the latter scenario meaning a win could see them wrap up the title in Monchengladbach next weekend.
"It is super Sunday in the Bundesliga," said Klopp. "And we are up at 1730."
However, Klopp says his side will not be interested in Leverkusen's result from the Allianz Arena.
"That should not have any influence over us," he said.
"We have a home game which makes us want to win irrespective of any result on any other pitch in the world."
Dortmund's stadium will once again be an 80,000 sell-out and Klopp hopes they can lift the team to success like they did against Hannover a fortnight ago.
"We are happy to have the fans lift us and anybody who wants to help out in making it an extraordinary atmosphere is more than welcome," he said.
Lucas Barrios is not going to experience that atmosphere from the pitch, though, since a muscular injury rules him out.
Robert Lewandowski will take his place in the Dortmund attack.
Apart from a few injury worries which see Simon Pouplin, Yacine Abdessadki, Felix Bastians and Jan Rosenthal miss the trip to Dortmund, Freiburg coach Robin Dutt has no other concerns ahead of the match.
His side's 3-2 win over Hoffenheim last weekend took them through the 40-point barrier, allowing them to be more relaxed about tomorrow's game safe in the knowledge they will still be playing Bundesliga football next season.
"The lads are really enjoying themselves and I have the impression that they are all relaxed," said Dutt.
"They are very motivated and concentrated and that makes us dangerous opponents."