Furth slipped to the bottom of the Bundesliga last weekend and have only won once all season, but Streich insists that does not reflect their true value.
"If you just look at the way Furth play, then you have got to take your hat off to them," he said.
"I therefore expect it to be a very interesting game.
"They played like we did in Hannover, yet they lost 2-0. They are playing the way we play, but don't have that bit of luck, but that makes them dangerous for us."
Freiburg's own football has won many plaudits this season, and they also have the results to go with it.
Indeed, with 20 points from the first 15 games of the season, they are just three points adrift of the top six, or more importantly, halfway to their aim of 40 for the season.
However, Streich has several selection problems with Fallou Diagne suspended and four others injured.
"We may have to improvise a little again, but we will certainly be able to put a competitive side together who will do all they can to make this a successful last home game of the year," added Streich.
"Our team can put (difficulties) behind them and this is pleasing and it shows the mental strength."
Guests Fortuna are already looking to the future by signing Japanese attacking midfielder Genki Omae.
The 22-year-old is not availableon Saturday as the deal can only go through in the new year, but the move is a sign of the club's ambition to stay in the top flight for at least another season.
"We have signed a quick and dangerous attack-minded player in Genki Omae," said Fortuna's director of sport Wolf Werner.
"He has already proven his ability at the highest level of Japanese football.
"We are pleased that we have been able to contract him to us and that he will be able to help us in the second half of the season."