Bundesliga leaders Borussia Dortmund will be without injured Paraguay striker Lucas Barrios for Sunday's clash with Freiburg.
The 26-year-old Barrios has a hamstring injury and his place will be taken by Poland striker Robert Lewnadowski, who will play as the lone striker, at Dortmund's sold-out stadium which has a capacity of 80,720.
Dortmund had a 12-point lead at the start of March, but the advantage has been clipped to just five points with five games remaining.
With second-placed Bayer Leverkusen travelling to defending champions Bayern Munich, who are fourth, on Sunday Klopp says his side are prepared to have their lead cut to just two points prior to kick-off.
"We face an important game, no question," said Klopp.
"But we are aware that our lead could be just two points by Sunday afternoon."
"The final stages of the season are exciting and we are here."
"Every week, my team has to prove they are willing to give everything."
Barrios is Dortmund's top scorer this season with 13 goals in 28 games.