Leipzig are in fourth place on 36 points, three behind visitors Union, who have won more league matches this season than leaders Bayern Munich.
The season may only be 10 matchdays young but Hertha Berlin and Sunday's league opponents Schalke 04 are already firmly locked in a battle for survival in the Bundesliga.
Union this season have picked up where they left off and after firing six goals past hosts Schalke 04 last week they have now scored 11 in their four league games -- another club record -- with Sheraldo Becker joint top scorer in the Bundesliga with four.
German fans are not allowed to light any form of smoke bombs, fireworks or flares inside the league stadiums and violation of that rule always leads to sanctions and fines.
The DFL had predicted a drop in turnover of about one billion euros during the 2020-21 season if fans had to stay away throughout the campaign.
"Hertha BSC's management have decided to part company with head coach Tayfun Korkut with immediate effect," the club said in a statement.
On Monday, the exact nature of the injury and the length of his absence were still unknown.
With 23 league goals so far this season, Lewandowski remains on course to finish as the Bundesliga's top-scorer for the fifth year running.
Visitors Freiburg will feel little pressure as they seek their first victory in Dortmund in 20 years.
Mueller celebrated his 400th Bundesliga appearance with a goal and an assist as the champions crushed VfL Wolfsburg 4-0 on Friday.
Union Berlin's next home game in the Europa Conference League is on Nov. 4 against Feyenoord.
Haaland has ruled himself out of Borussia Dortmund's Bundesliga match against Augsburg on Saturday and is set to miss Norway's upcoming World Cup qualifiers.
The 33-year-old Lewandowski has a Bayern contract until June 2023.
Neuer, 35, needed treatment on his right ankle during Tuesday's 3-1 win at Dortmund in the German Super Cup.
Pavard will miss this weekend's opening game of the Bundesliga season at Borussia Moenchengladbach with an injury.
The bald Dutchman scored his last league goal for Bayern in May 2019, amassing 99 goals in 201 Bundesliga matches.
Alaba said goodbye to Bayern Munich after defending the team’s colors since 2010, playing a vital role in the Bavarian’s success.
Bayern are ten points clear at the top of the league and an away win at Mainz will guarantee the title with three games remaining.
Moukoko became the youngest player to score in the Bundesliga but ended up on the losing side as they slumped to a 2-1 defeat at Union Berlin.
Treble winners Bayern Munich crushed Schalke 04 8-0 with a hat-trick from Serge Gnabry and a superb debut from Leroy Sane on Friday.