Slomka has led the club to the most successful two years in their history with back-to-back participations in the Europa League, yet he has so far refused to put pen-to-paper on a new deal since he still holds reservations about the club's ambition.
As he continues to stall, club president Martin Kind has warned him that time is running out and that he expects a decision within a month.
"We need to be able to plan for the future and that is why we need a decision, and I have set a deadline for December 20," he told Kicker magazine.
Slomka says he does not feel any extra pressure given Kind's remarks, though, as he focuses on delivering three points against Freiburg tomorrow [Saturday].
"As far as I am concerned, nothing has changed," he said at a press conference. "There is no new situation and the talks will continue and the decision will come in December."
His focus remains on keeping the Reds in contention for a third straight year in Europe, and a win over Freiburg could take them as high as third in the table.
Getting three points against such a "well-organised side" is not something Slomka is taking for granted, though.
"They have lost only one of their last five and that as against Dortmund, which I think says it all," said Slomka.
"They don't concede many goals and they have a lot of shots on goal so they are a tough nut to crack."
Freiburg have fond memories of their last trip to the Niedersachsenstadion.
A 0-0 draw in the Lower Saxony capital in April was enough for them to avoid relegation last season and a similar result tomorrow [Saturday] may lead to coach Christian Streich leaping onto the field again at the final whistle.
"That was a very good away game from us," he said. "That is what we are striving for again.
"If we can play like that again, then we have a realistic chance."
Streich is without Matthias Ginter for the rest of the calendar year after tests revealed he had a fractured vertebra.
Slomka has a fully-fit squad to choose from.